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Theorem List for Metamath Proof Explorer - 13901-14000   *Has distinct variable group(s)
TypeLabelDescription
Statement

Theoremrepsdf2 13901* Alternative definition of a "repeated symbol word". (Contributed by AV, 7-Nov-2018.)
((𝑆𝑉𝑁 ∈ ℕ0) → (𝑊 = (𝑆 repeatS 𝑁) ↔ (𝑊 ∈ Word 𝑉 ∧ (♯‘𝑊) = 𝑁 ∧ ∀𝑖 ∈ (0..^𝑁)(𝑊𝑖) = 𝑆)))

Theoremrepswsymball 13902* All the symbols of a "repeated symbol word" are the same. (Contributed by AV, 10-Nov-2018.)
((𝑊 ∈ Word 𝑉𝑆𝑉) → (𝑊 = (𝑆 repeatS (♯‘𝑊)) → ∀𝑖 ∈ (0..^(♯‘𝑊))(𝑊𝑖) = 𝑆))

Theoremrepswsymballbi 13903* A word is a "repeated symbol word" iff each of its symbols equals the first symbol of the word. (Contributed by AV, 10-Nov-2018.)
(𝑊 ∈ Word 𝑉 → (𝑊 = ((𝑊‘0) repeatS (♯‘𝑊)) ↔ ∀𝑖 ∈ (0..^(♯‘𝑊))(𝑊𝑖) = (𝑊‘0)))

Theoremrepswfsts 13904 The first symbol of a nonempty "repeated symbol word". (Contributed by AV, 4-Nov-2018.)
((𝑆𝑉𝑁 ∈ ℕ) → ((𝑆 repeatS 𝑁)‘0) = 𝑆)

Theoremrepswlsw 13905 The last symbol of a nonempty "repeated symbol word". (Contributed by AV, 4-Nov-2018.)
((𝑆𝑉𝑁 ∈ ℕ) → (lastS‘(𝑆 repeatS 𝑁)) = 𝑆)

Theoremrepsw1 13906 The "repeated symbol word" of length 1. (Contributed by AV, 4-Nov-2018.)
(𝑆𝑉 → (𝑆 repeatS 1) = ⟨“𝑆”⟩)

Theoremrepswswrd 13907 A subword of a "repeated symbol word" is again a "repeated symbol word". The assumption N <_ L is required, because otherwise ( L < N ): ((𝑆 repeatS 𝐿) substr ⟨𝑀, 𝑁⟩) = ∅, but for M < N (𝑆 repeatS (𝑁𝑀))) ≠ ∅! The proof is relatively long because the border cases (𝑀 = 𝑁, ¬ (𝑀..^𝑁) ⊆ (0..^𝐿) must have been considered. (Contributed by AV, 6-Nov-2018.)
(((𝑆𝑉𝐿 ∈ ℕ0) ∧ (𝑀 ∈ ℕ0𝑁 ∈ ℕ0) ∧ 𝑁𝐿) → ((𝑆 repeatS 𝐿) substr ⟨𝑀, 𝑁⟩) = (𝑆 repeatS (𝑁𝑀)))

Theoremrepswpfx 13908 A prefix of a repeated symbol word is a repeated symbol word. (Contributed by AV, 11-May-2020.)
((𝑆𝑉𝑁 ∈ ℕ0𝐿 ∈ (0...𝑁)) → ((𝑆 repeatS 𝑁) prefix 𝐿) = (𝑆 repeatS 𝐿))

Theoremrepswccat 13909 The concatenation of two "repeated symbol words" with the same symbol is again a "repeated symbol word". (Contributed by AV, 4-Nov-2018.)
((𝑆𝑉𝑁 ∈ ℕ0𝑀 ∈ ℕ0) → ((𝑆 repeatS 𝑁) ++ (𝑆 repeatS 𝑀)) = (𝑆 repeatS (𝑁 + 𝑀)))

Theoremrepswrevw 13910 The reverse of a "repeated symbol word". (Contributed by AV, 6-Nov-2018.)
((𝑆𝑉𝑁 ∈ ℕ0) → (reverse‘(𝑆 repeatS 𝑁)) = (𝑆 repeatS 𝑁))

5.7.14  Cyclical shifts of words

A word/string can be regarded as "necklace" by connecting the two ends of the word/string together (see Wikipedia "Necklace (combinatorics)", https://en.wikipedia.org/wiki/Necklace_(combinatorics)).

Two strings are regarded as the same necklace if one string can be rotated/circularly shifted/cyclically shifted to obtain the second string. To cope with words in the sense of necklaces, the rotation/cyclic shift cyclShift is defined as the basic operation, see df-csh 13913. The main theorems in this section are about counting the number of different necklaces resulting from cyclically shifting a given word, see cshwrepswhash1 16182 for words consisting of identical symbols and cshwshash 16184 for words having lengths which are prime numbers.

Syntaxccsh 13911 Extend class notation with Cyclical Shifts.
class cyclShift

SyntaxccshOLD 13912 Obsolete version of ccsh 13911 as of 12-Oct-2022. (New usage is discouraged.)
class cyclShiftOLD

Definitiondf-csh 13913* Perform a cyclical shift for an arbitrary class. Meaningful only for words 𝑤 ∈ Word 𝑆 or at least functions over half-open ranges of nonnegative integers. (Contributed by Alexander van der Vekens, 20-May-2018.) (Revised by Mario Carneiro/Alexander van der Vekens/ Gerard Lang, 17-Nov-2018.) (Revised by AV, 4-Nov-2022.)
cyclShift = (𝑤 ∈ {𝑓 ∣ ∃𝑙 ∈ ℕ0 𝑓 Fn (0..^𝑙)}, 𝑛 ∈ ℤ ↦ if(𝑤 = ∅, ∅, ((𝑤 substr ⟨(𝑛 mod (♯‘𝑤)), (♯‘𝑤)⟩) ++ (𝑤 prefix (𝑛 mod (♯‘𝑤))))))

Definitiondf-cshOLD 13914* Obsolete version of df-csh 13913 as of 12-Oct-2022. (Contributed by Alexander van der Vekens, 20-May-2018.) (Revised by Mario Carneiro/ Alexander van der Vekens/Gerard Lang, 17-Nov-2018.) (New usage is discouraged.)
cyclShiftOLD = (𝑤 ∈ {𝑓 ∣ ∃𝑙 ∈ ℕ0 𝑓 Fn (0..^𝑙)}, 𝑛 ∈ ℤ ↦ if(𝑤 = ∅, ∅, ((𝑤 substr ⟨(𝑛 mod (♯‘𝑤)), (♯‘𝑤)⟩) ++ (𝑤 substr ⟨0, (𝑛 mod (♯‘𝑤))⟩))))

Theoremcshfn 13915* Perform a cyclical shift for a function over a half-open range of nonnegative integers. (Contributed by AV, 20-May-2018.) (Revised by AV, 17-Nov-2018.) (Revised by AV, 4-Nov-2022.)
((𝑊 ∈ {𝑓 ∣ ∃𝑙 ∈ ℕ0 𝑓 Fn (0..^𝑙)} ∧ 𝑁 ∈ ℤ) → (𝑊 cyclShift 𝑁) = if(𝑊 = ∅, ∅, ((𝑊 substr ⟨(𝑁 mod (♯‘𝑊)), (♯‘𝑊)⟩) ++ (𝑊 prefix (𝑁 mod (♯‘𝑊))))))

TheoremcshfnOLD 13916* Obsolete version of cshfn 13915 as of 12-Oct-2022. (Contributed by AV, 20-May-2018.) (Revised by AV, 17-Nov-2018.) (New usage is discouraged.) (Proof modification is discouraged.)
((𝑊 ∈ {𝑓 ∣ ∃𝑙 ∈ ℕ0 𝑓 Fn (0..^𝑙)} ∧ 𝑁 ∈ ℤ) → (𝑊 cyclShiftOLD 𝑁) = if(𝑊 = ∅, ∅, ((𝑊 substr ⟨(𝑁 mod (♯‘𝑊)), (♯‘𝑊)⟩) ++ (𝑊 substr ⟨0, (𝑁 mod (♯‘𝑊))⟩))))

Theoremcshword 13917 Perform a cyclical shift for a word. (Contributed by Alexander van der Vekens, 20-May-2018.) (Revised by AV, 12-Oct-2022.)
((𝑊 ∈ Word 𝑉𝑁 ∈ ℤ) → (𝑊 cyclShift 𝑁) = ((𝑊 substr ⟨(𝑁 mod (♯‘𝑊)), (♯‘𝑊)⟩) ++ (𝑊 prefix (𝑁 mod (♯‘𝑊)))))

Theoremcshnz 13918 A cyclical shift is the empty set if the number of shifts is not an integer. (Contributed by Alexander van der Vekens, 21-May-2018.) (Revised by AV, 17-Nov-2018.)
𝑁 ∈ ℤ → (𝑊 cyclShift 𝑁) = ∅)

TheoremcshnzOLD 13919 Obsolete version of cshnz 13918 as of 12-Oct-2022. (Contributed by Alexander van der Vekens, 21-May-2018.) (Revised by AV, 17-Nov-2018.) (New usage is discouraged.) (Proof modification is discouraged.)
𝑁 ∈ ℤ → (𝑊 cyclShiftOLD 𝑁) = ∅)

Theorem0csh0 13920 Cyclically shifting an empty set/word always results in the empty word/set. (Contributed by AV, 25-Oct-2018.) (Revised by AV, 17-Nov-2018.)
(∅ cyclShift 𝑁) = ∅

Theorem0csh0OLD 13921 Obsolete version of cshnz 13918 as of 12-Oct-2022. (Contributed by AV, 25-Oct-2018.) (Revised by AV, 17-Nov-2018.) (New usage is discouraged.) (Proof modification is discouraged.)
(∅ cyclShiftOLD 𝑁) = ∅

Theoremcshw0 13922 A word cyclically shifted by 0 is the word itself. (Contributed by AV, 16-May-2018.) (Revised by AV, 20-May-2018.) (Revised by AV, 26-Oct-2018.)
(𝑊 ∈ Word 𝑉 → (𝑊 cyclShift 0) = 𝑊)

Theoremcshwmodn 13923 Cyclically shifting a word is invariant regarding modulo the word's length. (Contributed by AV, 26-Oct-2018.) (Proof shortened by AV, 16-Oct-2022.)
((𝑊 ∈ Word 𝑉𝑁 ∈ ℤ) → (𝑊 cyclShift 𝑁) = (𝑊 cyclShift (𝑁 mod (♯‘𝑊))))

Theoremcshwsublen 13924 Cyclically shifting a word is invariant regarding subtraction of the word's length. (Contributed by AV, 3-Nov-2018.)
((𝑊 ∈ Word 𝑉𝑁 ∈ ℤ) → (𝑊 cyclShift 𝑁) = (𝑊 cyclShift (𝑁 − (♯‘𝑊))))

Theoremcshwn 13925 A word cyclically shifted by its length is the word itself. (Contributed by AV, 16-May-2018.) (Revised by AV, 20-May-2018.) (Revised by AV, 26-Oct-2018.)
(𝑊 ∈ Word 𝑉 → (𝑊 cyclShift (♯‘𝑊)) = 𝑊)

Theoremcshwcl 13926 A cyclically shifted word is a word over the same set as for the original word. (Contributed by AV, 16-May-2018.) (Revised by AV, 21-May-2018.) (Revised by AV, 27-Oct-2018.)
(𝑊 ∈ Word 𝑉 → (𝑊 cyclShift 𝑁) ∈ Word 𝑉)

Theoremcshwlen 13927 The length of a cyclically shifted word is the same as the length of the original word. (Contributed by AV, 16-May-2018.) (Revised by AV, 20-May-2018.) (Revised by AV, 27-Oct-2018.) (Proof shortened by AV, 16-Oct-2022.)
((𝑊 ∈ Word 𝑉𝑁 ∈ ℤ) → (♯‘(𝑊 cyclShift 𝑁)) = (♯‘𝑊))

Theoremcshwf 13928 A cyclically shifted word is a function from a half-open range of integers of the same length as the word as domain to the set of symbols for the word. (Contributed by AV, 12-Nov-2018.)
((𝑊 ∈ Word 𝐴𝑁 ∈ ℤ) → (𝑊 cyclShift 𝑁):(0..^(♯‘𝑊))⟶𝐴)

Theoremcshwfn 13929 A cyclically shifted word is a function with a half-open range of integers of the same length as the word as domain. (Contributed by AV, 12-Nov-2018.)
((𝑊 ∈ Word 𝑉𝑁 ∈ ℤ) → (𝑊 cyclShift 𝑁) Fn (0..^(♯‘𝑊)))

Theoremcshwrn 13930 The range of a cyclically shifted word is a subset of the set of symbols for the word. (Contributed by AV, 12-Nov-2018.)
((𝑊 ∈ Word 𝑉𝑁 ∈ ℤ) → ran (𝑊 cyclShift 𝑁) ⊆ 𝑉)

Theoremcshwidxmod 13931 The symbol at a given index of a cyclically shifted nonempty word is the symbol at the shifted index of the original word. (Contributed by AV, 13-May-2018.) (Revised by AV, 21-May-2018.) (Revised by AV, 30-Oct-2018.) (Proof shortened by AV, 12-Oct-2022.)
((𝑊 ∈ Word 𝑉𝑁 ∈ ℤ ∧ 𝐼 ∈ (0..^(♯‘𝑊))) → ((𝑊 cyclShift 𝑁)‘𝐼) = (𝑊‘((𝐼 + 𝑁) mod (♯‘𝑊))))

Theoremcshwidxmodr 13932 The symbol at a given index of a cyclically shifted nonempty word is the symbol at the shifted index of the original word. (Contributed by AV, 17-Mar-2021.)
((𝑊 ∈ Word 𝑉𝑁 ∈ ℤ ∧ 𝐼 ∈ (0..^(♯‘𝑊))) → ((𝑊 cyclShift 𝑁)‘((𝐼𝑁) mod (♯‘𝑊))) = (𝑊𝐼))

Theoremcshwidx0mod 13933 The symbol at index 0 of a cyclically shifted nonempty word is the symbol at index N (modulo the length of the word) of the original word. (Contributed by AV, 30-Oct-2018.)
((𝑊 ∈ Word 𝑉𝑊 ≠ ∅ ∧ 𝑁 ∈ ℤ) → ((𝑊 cyclShift 𝑁)‘0) = (𝑊‘(𝑁 mod (♯‘𝑊))))

Theoremcshwidx0 13934 The symbol at index 0 of a cyclically shifted nonempty word is the symbol at index N of the original word. (Contributed by AV, 15-May-2018.) (Revised by AV, 21-May-2018.) (Revised by AV, 30-Oct-2018.)
((𝑊 ∈ Word 𝑉𝑁 ∈ (0..^(♯‘𝑊))) → ((𝑊 cyclShift 𝑁)‘0) = (𝑊𝑁))

Theoremcshwidxm1 13935 The symbol at index ((n-N)-1) of a word of length n (not 0) cyclically shifted by N positions is the symbol at index (n-1) of the original word. (Contributed by AV, 23-Mar-2018.) (Revised by AV, 21-May-2018.) (Revised by AV, 30-Oct-2018.)
((𝑊 ∈ Word 𝑉𝑁 ∈ (0..^(♯‘𝑊))) → ((𝑊 cyclShift 𝑁)‘(((♯‘𝑊) − 𝑁) − 1)) = (𝑊‘((♯‘𝑊) − 1)))

Theoremcshwidxm 13936 The symbol at index (n-N) of a word of length n (not 0) cyclically shifted by N positions (not 0) is the symbol at index 0 of the original word. (Contributed by AV, 18-May-2018.) (Revised by AV, 21-May-2018.) (Revised by AV, 30-Oct-2018.)
((𝑊 ∈ Word 𝑉𝑁 ∈ (1...(♯‘𝑊))) → ((𝑊 cyclShift 𝑁)‘((♯‘𝑊) − 𝑁)) = (𝑊‘0))

Theoremcshwidxn 13937 The symbol at index (n-1) of a word of length n (not 0) cyclically shifted by N positions (not 0) is the symbol at index (N-1) of the original word. (Contributed by AV, 18-May-2018.) (Revised by AV, 21-May-2018.) (Revised by AV, 30-Oct-2018.)
((𝑊 ∈ Word 𝑉𝑁 ∈ (1...(♯‘𝑊))) → ((𝑊 cyclShift 𝑁)‘((♯‘𝑊) − 1)) = (𝑊‘(𝑁 − 1)))

Theoremcshf1 13938 Cyclically shifting a word which contains a symbol at most once results in a word which contains a symbol at most once. (Contributed by AV, 14-Mar-2021.)
((𝐹:(0..^(♯‘𝐹))–1-1𝐴𝑆 ∈ ℤ ∧ 𝐺 = (𝐹 cyclShift 𝑆)) → 𝐺:(0..^(♯‘𝐹))–1-1𝐴)

Theoremcshinj 13939 If a word is injectiv (regarded as function), the cyclically shifted word is also injective. (Contributed by AV, 14-Mar-2021.)
((𝐹 ∈ Word 𝐴 ∧ Fun 𝐹𝑆 ∈ ℤ) → (𝐺 = (𝐹 cyclShift 𝑆) → Fun 𝐺))

Theoremrepswcshw 13940 A cyclically shifted "repeated symbol word". (Contributed by Alexander van der Vekens, 7-Nov-2018.) (Proof shortened by AV, 16-Oct-2022.)
((𝑆𝑉𝑁 ∈ ℕ0𝐼 ∈ ℤ) → ((𝑆 repeatS 𝑁) cyclShift 𝐼) = (𝑆 repeatS 𝑁))

Theorem2cshw 13941 Cyclically shifting a word two times. (Contributed by AV, 7-Apr-2018.) (Revised by AV, 4-Jun-2018.) (Revised by AV, 31-Oct-2018.)
((𝑊 ∈ Word 𝑉𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ) → ((𝑊 cyclShift 𝑀) cyclShift 𝑁) = (𝑊 cyclShift (𝑀 + 𝑁)))

Theorem2cshwid 13942 Cyclically shifting a word two times resulting in the word itself. (Contributed by AV, 7-Apr-2018.) (Revised by AV, 5-Jun-2018.) (Revised by AV, 1-Nov-2018.)
((𝑊 ∈ Word 𝑉𝑁 ∈ ℤ) → ((𝑊 cyclShift 𝑁) cyclShift ((♯‘𝑊) − 𝑁)) = 𝑊)

Theoremlswcshw 13943 The last symbol of a word cyclically shifted by N positions is the symbol at index (N-1) of the original word. (Contributed by AV, 21-Mar-2018.) (Revised by AV, 5-Jun-2018.) (Revised by AV, 1-Nov-2018.)
((𝑊 ∈ Word 𝑉𝑁 ∈ (1...(♯‘𝑊))) → (lastS‘(𝑊 cyclShift 𝑁)) = (𝑊‘(𝑁 − 1)))

Theorem2cshwcom 13944 Cyclically shifting a word two times is commutative. (Contributed by AV, 21-Apr-2018.) (Revised by AV, 5-Jun-2018.) (Revised by Mario Carneiro/AV, 1-Nov-2018.)
((𝑊 ∈ Word 𝑉𝑁 ∈ ℤ ∧ 𝑀 ∈ ℤ) → ((𝑊 cyclShift 𝑁) cyclShift 𝑀) = ((𝑊 cyclShift 𝑀) cyclShift 𝑁))

Theoremcshwleneq 13945 If the results of cyclically shifting two words are equal, the length of the two words was equal. (Contributed by AV, 21-Apr-2018.) (Revised by AV, 5-Jun-2018.) (Revised by AV, 1-Nov-2018.)
(((𝑊 ∈ Word 𝑉𝑈 ∈ Word 𝑉) ∧ (𝑁 ∈ ℤ ∧ 𝑀 ∈ ℤ) ∧ (𝑊 cyclShift 𝑁) = (𝑈 cyclShift 𝑀)) → (♯‘𝑊) = (♯‘𝑈))

Theorem3cshw 13946 Cyclically shifting a word three times results in a once cyclically shifted word under certain circumstances. (Contributed by AV, 6-Jun-2018.) (Revised by AV, 1-Nov-2018.)
((𝑊 ∈ Word 𝑉𝑁 ∈ ℤ ∧ 𝑀 ∈ ℤ) → (𝑊 cyclShift 𝑁) = (((𝑊 cyclShift 𝑀) cyclShift 𝑁) cyclShift ((♯‘𝑊) − 𝑀)))

Theoremcshweqdif2 13947 If cyclically shifting two words (of the same length) results in the same word, cyclically shifting one of the words by the difference of the numbers of shifts results in the other word. (Contributed by AV, 21-Apr-2018.) (Revised by AV, 6-Jun-2018.) (Revised by AV, 1-Nov-2018.)
(((𝑊 ∈ Word 𝑉𝑈 ∈ Word 𝑉) ∧ (𝑁 ∈ ℤ ∧ 𝑀 ∈ ℤ)) → ((𝑊 cyclShift 𝑁) = (𝑈 cyclShift 𝑀) → (𝑈 cyclShift (𝑀𝑁)) = 𝑊))

Theoremcshweqdifid 13948 If cyclically shifting a word by two positions results in the same word, cyclically shifting the word by the difference of these two positions results in the original word itself. (Contributed by AV, 21-Apr-2018.) (Revised by AV, 7-Jun-2018.) (Revised by AV, 1-Nov-2018.)
((𝑊 ∈ Word 𝑉𝑁 ∈ ℤ ∧ 𝑀 ∈ ℤ) → ((𝑊 cyclShift 𝑁) = (𝑊 cyclShift 𝑀) → (𝑊 cyclShift (𝑀𝑁)) = 𝑊))

Theoremcshweqrep 13949* If cyclically shifting a word by L position results in the word itself, the symbol at any position is repeated at multiples of L (modulo the length of the word) positions in the word. (Contributed by AV, 13-May-2018.) (Revised by AV, 7-Jun-2018.) (Revised by AV, 1-Nov-2018.)
((𝑊 ∈ Word 𝑉𝐿 ∈ ℤ) → (((𝑊 cyclShift 𝐿) = 𝑊𝐼 ∈ (0..^(♯‘𝑊))) → ∀𝑗 ∈ ℕ0 (𝑊𝐼) = (𝑊‘((𝐼 + (𝑗 · 𝐿)) mod (♯‘𝑊)))))

Theoremcshw1 13950* If cyclically shifting a word by 1 position results in the word itself, the word is build of identical symbols. Remark: also "valid" for an empty word! (Contributed by AV, 13-May-2018.) (Revised by AV, 7-Jun-2018.) (Proof shortened by AV, 1-Nov-2018.)
((𝑊 ∈ Word 𝑉 ∧ (𝑊 cyclShift 1) = 𝑊) → ∀𝑖 ∈ (0..^(♯‘𝑊))(𝑊𝑖) = (𝑊‘0))

Theoremcshw1repsw 13951 If cyclically shifting a word by 1 position results in the word itself, the word is a "repeated symbol word". Remark: also "valid" for an empty word! (Contributed by AV, 8-Nov-2018.) (Proof shortened by AV, 10-Nov-2018.)
((𝑊 ∈ Word 𝑉 ∧ (𝑊 cyclShift 1) = 𝑊) → 𝑊 = ((𝑊‘0) repeatS (♯‘𝑊)))

Theoremcshwsexa 13952* The class of (different!) words resulting by cyclically shifting something (not necessarily a word) is a set. (Contributed by AV, 8-Jun-2018.) (Revised by Mario Carneiro/AV, 25-Oct-2018.)
{𝑤 ∈ Word 𝑉 ∣ ∃𝑛 ∈ (0..^(♯‘𝑊))(𝑊 cyclShift 𝑛) = 𝑤} ∈ V

Theorem2cshwcshw 13953* If a word is a cyclically shifted word, and a second word is the result of cyclically shifting the same word, then the second word is the result of cyclically shifting the first word. (Contributed by AV, 11-May-2018.) (Revised by AV, 12-Jun-2018.) (Proof shortened by AV, 3-Nov-2018.)
((𝑌 ∈ Word 𝑉 ∧ (♯‘𝑌) = 𝑁) → ((𝐾 ∈ (0...𝑁) ∧ 𝑋 = (𝑌 cyclShift 𝐾) ∧ ∃𝑚 ∈ (0...𝑁)𝑍 = (𝑌 cyclShift 𝑚)) → ∃𝑛 ∈ (0...𝑁)𝑍 = (𝑋 cyclShift 𝑛)))

Theoremscshwfzeqfzo 13954* For a nonempty word the sets of shifted words, expressd by a finite interval of integers or by a half-open integer range are identical. (Contributed by Alexander van der Vekens, 15-Jun-2018.)
((𝑋 ∈ Word 𝑉𝑋 ≠ ∅ ∧ 𝑁 = (♯‘𝑋)) → {𝑦 ∈ Word 𝑉 ∣ ∃𝑛 ∈ (0...𝑁)𝑦 = (𝑋 cyclShift 𝑛)} = {𝑦 ∈ Word 𝑉 ∣ ∃𝑛 ∈ (0..^𝑁)𝑦 = (𝑋 cyclShift 𝑛)})

Theoremcshwcshid 13955* A cyclically shifted word can be reconstructed by cyclically shifting it again. Lemma for erclwwlksym 27366 and erclwwlknsym 27423. (Contributed by AV, 8-Apr-2018.) (Revised by AV, 11-Jun-2018.) (Proof shortened by AV, 3-Nov-2018.)
(𝜑𝑦 ∈ Word 𝑉)    &   (𝜑 → (♯‘𝑥) = (♯‘𝑦))       (𝜑 → ((𝑚 ∈ (0...(♯‘𝑦)) ∧ 𝑥 = (𝑦 cyclShift 𝑚)) → ∃𝑛 ∈ (0...(♯‘𝑥))𝑦 = (𝑥 cyclShift 𝑛)))

Theoremcshwcsh2id 13956* A cyclically shifted word can be reconstructed by cyclically shifting it again twice. Lemma for erclwwlktr 27367 and erclwwlkntr 27424. (Contributed by AV, 9-Apr-2018.) (Revised by AV, 11-Jun-2018.) (Proof shortened by AV, 3-Nov-2018.)
(𝜑𝑧 ∈ Word 𝑉)    &   (𝜑 → ((♯‘𝑦) = (♯‘𝑧) ∧ (♯‘𝑥) = (♯‘𝑦)))       (𝜑 → (((𝑚 ∈ (0...(♯‘𝑦)) ∧ 𝑥 = (𝑦 cyclShift 𝑚)) ∧ (𝑘 ∈ (0...(♯‘𝑧)) ∧ 𝑦 = (𝑧 cyclShift 𝑘))) → ∃𝑛 ∈ (0...(♯‘𝑧))𝑥 = (𝑧 cyclShift 𝑛)))

Theoremcshimadifsn 13957 The image of a cyclically shifted word under its domain without its left bound is the image of a cyclically shifted word under its domain without the number of shifted symbols. (Contributed by AV, 19-Mar-2021.)
((𝐹 ∈ Word 𝑆𝑁 = (♯‘𝐹) ∧ 𝐽 ∈ (0..^𝑁)) → (𝐹 “ ((0..^𝑁) ∖ {𝐽})) = ((𝐹 cyclShift 𝐽) “ (1..^𝑁)))

Theoremcshimadifsn0 13958 The image of a cyclically shifted word under its domain without its upper bound is the image of a cyclically shifted word under its domain without the number of shifted symbols. (Contributed by AV, 19-Mar-2021.)
((𝐹 ∈ Word 𝑆𝑁 = (♯‘𝐹) ∧ 𝐽 ∈ (0..^𝑁)) → (𝐹 “ ((0..^𝑁) ∖ {𝐽})) = ((𝐹 cyclShift (𝐽 + 1)) “ (0..^(𝑁 − 1))))

5.7.15  Mapping words by a function

Theoremwrdco 13959 Mapping a word by a function. (Contributed by Stefan O'Rear, 27-Aug-2015.)
((𝑊 ∈ Word 𝐴𝐹:𝐴𝐵) → (𝐹𝑊) ∈ Word 𝐵)

Theoremlenco 13960 Length of a mapped word is unchanged. (Contributed by Stefan O'Rear, 27-Aug-2015.)
((𝑊 ∈ Word 𝐴𝐹:𝐴𝐵) → (♯‘(𝐹𝑊)) = (♯‘𝑊))

Theorems1co 13961 Mapping of a singleton word. (Contributed by Mario Carneiro, 27-Sep-2015.) (Revised by Mario Carneiro, 26-Feb-2016.)
((𝑆𝐴𝐹:𝐴𝐵) → (𝐹 ∘ ⟨“𝑆”⟩) = ⟨“(𝐹𝑆)”⟩)

Theoremrevco 13962 Mapping of words (i.e., a letterwise mapping) commutes with reversal. (Contributed by Stefan O'Rear, 27-Aug-2015.)
((𝑊 ∈ Word 𝐴𝐹:𝐴𝐵) → (𝐹 ∘ (reverse‘𝑊)) = (reverse‘(𝐹𝑊)))

Theoremccatco 13963 Mapping of words commutes with concatenation. (Contributed by Stefan O'Rear, 27-Aug-2015.)
((𝑆 ∈ Word 𝐴𝑇 ∈ Word 𝐴𝐹:𝐴𝐵) → (𝐹 ∘ (𝑆 ++ 𝑇)) = ((𝐹𝑆) ++ (𝐹𝑇)))

Theoremcshco 13964 Mapping of words commutes with the "cyclical shift" operation. (Contributed by AV, 12-Nov-2018.)
((𝑊 ∈ Word 𝐴𝑁 ∈ ℤ ∧ 𝐹:𝐴𝐵) → (𝐹 ∘ (𝑊 cyclShift 𝑁)) = ((𝐹𝑊) cyclShift 𝑁))

Theoremswrdco 13965 Mapping of words commutes with the substring operation. (Contributed by AV, 11-Nov-2018.)
((𝑊 ∈ Word 𝐴 ∧ (𝑀 ∈ (0...𝑁) ∧ 𝑁 ∈ (0...(♯‘𝑊))) ∧ 𝐹:𝐴𝐵) → (𝐹 ∘ (𝑊 substr ⟨𝑀, 𝑁⟩)) = ((𝐹𝑊) substr ⟨𝑀, 𝑁⟩))

Theorempfxco 13966 Mapping of words commutes with the prefix operation. (Contributed by AV, 15-May-2020.)
((𝑊 ∈ Word 𝐴𝑁 ∈ (0...(♯‘𝑊)) ∧ 𝐹:𝐴𝐵) → (𝐹 ∘ (𝑊 prefix 𝑁)) = ((𝐹𝑊) prefix 𝑁))

Theoremlswco 13967 Mapping of (nonempty) words commutes with the "last symbol" operation. This theorem would not hold if 𝑊 = ∅, (𝐹‘∅) ≠ ∅ and ∅ ∈ 𝐴, because then (lastS‘(𝐹𝑊)) = (lastS‘∅) = ∅ ≠ (𝐹‘∅) = (𝐹(lastS‘𝑊)). (Contributed by AV, 11-Nov-2018.)
((𝑊 ∈ Word 𝐴𝑊 ≠ ∅ ∧ 𝐹:𝐴𝐵) → (lastS‘(𝐹𝑊)) = (𝐹‘(lastS‘𝑊)))

Theoremrepsco 13968 Mapping of words commutes with the "repeated symbol" operation. (Contributed by AV, 11-Nov-2018.)
((𝑆𝐴𝑁 ∈ ℕ0𝐹:𝐴𝐵) → (𝐹 ∘ (𝑆 repeatS 𝑁)) = ((𝐹𝑆) repeatS 𝑁))

5.7.16  Longer string literals

Syntaxcs2 13969 Syntax for the length 2 word constructor.
class ⟨“𝐴𝐵”⟩

Syntaxcs3 13970 Syntax for the length 3 word constructor.
class ⟨“𝐴𝐵𝐶”⟩

Syntaxcs4 13971 Syntax for the length 4 word constructor.
class ⟨“𝐴𝐵𝐶𝐷”⟩

Syntaxcs5 13972 Syntax for the length 5 word constructor.
class ⟨“𝐴𝐵𝐶𝐷𝐸”⟩

Syntaxcs6 13973 Syntax for the length 6 word constructor.
class ⟨“𝐴𝐵𝐶𝐷𝐸𝐹”⟩

Syntaxcs7 13974 Syntax for the length 7 word constructor.
class ⟨“𝐴𝐵𝐶𝐷𝐸𝐹𝐺”⟩

Syntaxcs8 13975 Syntax for the length 8 word constructor.
class ⟨“𝐴𝐵𝐶𝐷𝐸𝐹𝐺𝐻”⟩

Definitiondf-s2 13976 Define the length 2 word constructor. (Contributed by Mario Carneiro, 26-Feb-2016.)
⟨“𝐴𝐵”⟩ = (⟨“𝐴”⟩ ++ ⟨“𝐵”⟩)

Definitiondf-s3 13977 Define the length 3 word constructor. (Contributed by Mario Carneiro, 26-Feb-2016.)
⟨“𝐴𝐵𝐶”⟩ = (⟨“𝐴𝐵”⟩ ++ ⟨“𝐶”⟩)

Definitiondf-s4 13978 Define the length 4 word constructor. (Contributed by Mario Carneiro, 26-Feb-2016.)
⟨“𝐴𝐵𝐶𝐷”⟩ = (⟨“𝐴𝐵𝐶”⟩ ++ ⟨“𝐷”⟩)

Definitiondf-s5 13979 Define the length 5 word constructor. (Contributed by Mario Carneiro, 26-Feb-2016.)
⟨“𝐴𝐵𝐶𝐷𝐸”⟩ = (⟨“𝐴𝐵𝐶𝐷”⟩ ++ ⟨“𝐸”⟩)

Definitiondf-s6 13980 Define the length 6 word constructor. (Contributed by Mario Carneiro, 26-Feb-2016.)
⟨“𝐴𝐵𝐶𝐷𝐸𝐹”⟩ = (⟨“𝐴𝐵𝐶𝐷𝐸”⟩ ++ ⟨“𝐹”⟩)

Definitiondf-s7 13981 Define the length 7 word constructor. (Contributed by Mario Carneiro, 26-Feb-2016.)
⟨“𝐴𝐵𝐶𝐷𝐸𝐹𝐺”⟩ = (⟨“𝐴𝐵𝐶𝐷𝐸𝐹”⟩ ++ ⟨“𝐺”⟩)

Definitiondf-s8 13982 Define the length 8 word constructor. (Contributed by Mario Carneiro, 26-Feb-2016.)
⟨“𝐴𝐵𝐶𝐷𝐸𝐹𝐺𝐻”⟩ = (⟨“𝐴𝐵𝐶𝐷𝐸𝐹𝐺”⟩ ++ ⟨“𝐻”⟩)

Theoremcats1cld 13983 Closure of concatenation with a singleton word. (Contributed by Mario Carneiro, 26-Feb-2016.)
𝑇 = (𝑆 ++ ⟨“𝑋”⟩)    &   (𝜑𝑆 ∈ Word 𝐴)    &   (𝜑𝑋𝐴)       (𝜑𝑇 ∈ Word 𝐴)

Theoremcats1co 13984 Closure of concatenation with a singleton word. (Contributed by Mario Carneiro, 26-Feb-2016.)
𝑇 = (𝑆 ++ ⟨“𝑋”⟩)    &   (𝜑𝑆 ∈ Word 𝐴)    &   (𝜑𝑋𝐴)    &   (𝜑𝐹:𝐴𝐵)    &   (𝜑 → (𝐹𝑆) = 𝑈)    &   𝑉 = (𝑈 ++ ⟨“(𝐹𝑋)”⟩)       (𝜑 → (𝐹𝑇) = 𝑉)

Theoremcats1cli 13985 Closure of concatenation with a singleton word. (Contributed by Mario Carneiro, 26-Feb-2016.)
𝑇 = (𝑆 ++ ⟨“𝑋”⟩)    &   𝑆 ∈ Word V       𝑇 ∈ Word V

Theoremcats1fvn 13986 The last symbol of a concatenation with a singleton word. (Contributed by Mario Carneiro, 26-Feb-2016.)
𝑇 = (𝑆 ++ ⟨“𝑋”⟩)    &   𝑆 ∈ Word V    &   (♯‘𝑆) = 𝑀       (𝑋𝑉 → (𝑇𝑀) = 𝑋)

Theoremcats1fv 13987 A symbol other than the last in a concatenation with a singleton word. (Contributed by Mario Carneiro, 26-Feb-2016.)
𝑇 = (𝑆 ++ ⟨“𝑋”⟩)    &   𝑆 ∈ Word V    &   (♯‘𝑆) = 𝑀    &   (𝑌𝑉 → (𝑆𝑁) = 𝑌)    &   𝑁 ∈ ℕ0    &   𝑁 < 𝑀       (𝑌𝑉 → (𝑇𝑁) = 𝑌)

Theoremcats1len 13988 The length of concatenation with a singleton word. (Contributed by Mario Carneiro, 26-Feb-2016.)
𝑇 = (𝑆 ++ ⟨“𝑋”⟩)    &   𝑆 ∈ Word V    &   (♯‘𝑆) = 𝑀    &   (𝑀 + 1) = 𝑁       (♯‘𝑇) = 𝑁

Theoremcats1cat 13989 Closure of concatenation with a singleton word. (Contributed by Mario Carneiro, 26-Feb-2016.)
𝑇 = (𝑆 ++ ⟨“𝑋”⟩)    &   𝐴 ∈ Word V    &   𝑆 ∈ Word V    &   𝐶 = (𝐵 ++ ⟨“𝑋”⟩)    &   𝐵 = (𝐴 ++ 𝑆)       𝐶 = (𝐴 ++ 𝑇)

Theoremcats2cat 13990 Closure of concatenation of concatenations with singleton words. (Contributed by AV, 1-Mar-2021.)
𝐵 ∈ Word V    &   𝐷 ∈ Word V    &   𝐴 = (𝐵 ++ ⟨“𝑋”⟩)    &   𝐶 = (⟨“𝑌”⟩ ++ 𝐷)       (𝐴 ++ 𝐶) = ((𝐵 ++ ⟨“𝑋𝑌”⟩) ++ 𝐷)

Theorems2eqd 13991 Equality theorem for a doubleton word. (Contributed by Mario Carneiro, 27-Feb-2016.)
(𝜑𝐴 = 𝑁)    &   (𝜑𝐵 = 𝑂)       (𝜑 → ⟨“𝐴𝐵”⟩ = ⟨“𝑁𝑂”⟩)

Theorems3eqd 13992 Equality theorem for a length 3 word. (Contributed by Mario Carneiro, 27-Feb-2016.)
(𝜑𝐴 = 𝑁)    &   (𝜑𝐵 = 𝑂)    &   (𝜑𝐶 = 𝑃)       (𝜑 → ⟨“𝐴𝐵𝐶”⟩ = ⟨“𝑁𝑂𝑃”⟩)

Theorems4eqd 13993 Equality theorem for a length 4 word. (Contributed by Mario Carneiro, 27-Feb-2016.)
(𝜑𝐴 = 𝑁)    &   (𝜑𝐵 = 𝑂)    &   (𝜑𝐶 = 𝑃)    &   (𝜑𝐷 = 𝑄)       (𝜑 → ⟨“𝐴𝐵𝐶𝐷”⟩ = ⟨“𝑁𝑂𝑃𝑄”⟩)

Theorems5eqd 13994 Equality theorem for a length 5 word. (Contributed by Mario Carneiro, 27-Feb-2016.)
(𝜑𝐴 = 𝑁)    &   (𝜑𝐵 = 𝑂)    &   (𝜑𝐶 = 𝑃)    &   (𝜑𝐷 = 𝑄)    &   (𝜑𝐸 = 𝑅)       (𝜑 → ⟨“𝐴𝐵𝐶𝐷𝐸”⟩ = ⟨“𝑁𝑂𝑃𝑄𝑅”⟩)

Theorems6eqd 13995 Equality theorem for a length 6 word. (Contributed by Mario Carneiro, 27-Feb-2016.)
(𝜑𝐴 = 𝑁)    &   (𝜑𝐵 = 𝑂)    &   (𝜑𝐶 = 𝑃)    &   (𝜑𝐷 = 𝑄)    &   (𝜑𝐸 = 𝑅)    &   (𝜑𝐹 = 𝑆)       (𝜑 → ⟨“𝐴𝐵𝐶𝐷𝐸𝐹”⟩ = ⟨“𝑁𝑂𝑃𝑄𝑅𝑆”⟩)

Theorems7eqd 13996 Equality theorem for a length 7 word. (Contributed by Mario Carneiro, 27-Feb-2016.)
(𝜑𝐴 = 𝑁)    &   (𝜑𝐵 = 𝑂)    &   (𝜑𝐶 = 𝑃)    &   (𝜑𝐷 = 𝑄)    &   (𝜑𝐸 = 𝑅)    &   (𝜑𝐹 = 𝑆)    &   (𝜑𝐺 = 𝑇)       (𝜑 → ⟨“𝐴𝐵𝐶𝐷𝐸𝐹𝐺”⟩ = ⟨“𝑁𝑂𝑃𝑄𝑅𝑆𝑇”⟩)

Theorems8eqd 13997 Equality theorem for a length 8 word. (Contributed by Mario Carneiro, 27-Feb-2016.)
(𝜑𝐴 = 𝑁)    &   (𝜑𝐵 = 𝑂)    &   (𝜑𝐶 = 𝑃)    &   (𝜑𝐷 = 𝑄)    &   (𝜑𝐸 = 𝑅)    &   (𝜑𝐹 = 𝑆)    &   (𝜑𝐺 = 𝑇)    &   (𝜑𝐻 = 𝑈)       (𝜑 → ⟨“𝐴𝐵𝐶𝐷𝐸𝐹𝐺𝐻”⟩ = ⟨“𝑁𝑂𝑃𝑄𝑅𝑆𝑇𝑈”⟩)

Theorems3eq2 13998 Equality theorem for a length 3 word for the second symbol. (Contributed by AV, 4-Jan-2022.)
(𝐵 = 𝐷 → ⟨“𝐴𝐵𝐶”⟩ = ⟨“𝐴𝐷𝐶”⟩)

Theorems2cld 13999 A doubleton word is a word. (Contributed by Mario Carneiro, 27-Feb-2016.)
(𝜑𝐴𝑋)    &   (𝜑𝐵𝑋)       (𝜑 → ⟨“𝐴𝐵”⟩ ∈ Word 𝑋)

Theorems3cld 14000 A length 3 string is a word. (Contributed by Mario Carneiro, 27-Feb-2016.)
(𝜑𝐴𝑋)    &   (𝜑𝐵𝑋)    &   (𝜑𝐶𝑋)       (𝜑 → ⟨“𝐴𝐵𝐶”⟩ ∈ Word 𝑋)

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206 20501-20600 207 20601-20700 208 20701-20800 209 20801-20900 210 20901-21000 211 21001-21100 212 21101-21200 213 21201-21300 214 21301-21400 215 21401-21500 216 21501-21600 217 21601-21700 218 21701-21800 219 21801-21900 220 21901-22000 221 22001-22100 222 22101-22200 223 22201-22300 224 22301-22400 225 22401-22500 226 22501-22600 227 22601-22700 228 22701-22800 229 22801-22900 230 22901-23000 231 23001-23100 232 23101-23200 233 23201-23300 234 23301-23400 235 23401-23500 236 23501-23600 237 23601-23700 238 23701-23800 239 23801-23900 240 23901-24000 241 24001-24100 242 24101-24200 243 24201-24300 244 24301-24400 245 24401-24500 246 24501-24600 247 24601-24700 248 24701-24800 249 24801-24900 250 24901-25000 251 25001-25100 252 25101-25200 253 25201-25300 254 25301-25400 255 25401-25500 256 25501-25600 257 25601-25700 258 25701-25800 259 25801-25900 260 25901-26000 261 26001-26100 262 26101-26200 263 26201-26300 264 26301-26400 265 26401-26500 266 26501-26600 267 26601-26700 268 26701-26800 269 26801-26900 270 26901-27000 271 27001-27100 272 27101-27200 273 27201-27300 274 27301-27400 275 27401-27500 276 27501-27600 277 27601-27700 278 27701-27800 279 27801-27900 280 27901-28000 281 28001-28100 282 28101-28200 283 28201-28300 284 28301-28400 285 28401-28500 286 28501-28600 287 28601-28700 288 28701-28800 289 28801-28900 290 28901-29000 291 29001-29100 292 29101-29200 293 29201-29300 294 29301-29400 295 29401-29500 296 29501-29600 297 29601-29700 298 29701-29800 299 29801-29900 300 29901-30000 301 30001-30100 302 30101-30200 303 30201-30300 304 30301-30400 305 30401-30500 306 30501-30600 307 30601-30700 308 30701-30800 309 30801-30900 310 30901-31000 311 31001-31100 312 31101-31200 313 31201-31300 314 31301-31400 315 31401-31500 316 31501-31600 317 31601-31700 318 31701-31800 319 31801-31900 320 31901-32000 321 32001-32100 322 32101-32200 323 32201-32300 324 32301-32400 325 32401-32500 326 32501-32600 327 32601-32700 328 32701-32800 329 32801-32900 330 32901-33000 331 33001-33100 332 33101-33200 333 33201-33300 334 33301-33400 335 33401-33500 336 33501-33600 337 33601-33700 338 33701-33800 339 33801-33900 340 33901-34000 341 34001-34100 342 34101-34200 343 34201-34300 344 34301-34400 345 34401-34500 346 34501-34600 347 34601-34700 348 34701-34800 349 34801-34900 350 34901-35000 351 35001-35100 352 35101-35200 353 35201-35300 354 35301-35400 355 35401-35500 356 35501-35600 357 35601-35700 358 35701-35800 359 35801-35900 360 35901-36000 361 36001-36100 362 36101-36200 363 36201-36300 364 36301-36400 365 36401-36500 366 36501-36600 367 36601-36700 368 36701-36800 369 36801-36900 370 36901-37000 371 37001-37100 372 37101-37200 373 37201-37300 374 37301-37400 375 37401-37500 376 37501-37600 377 37601-37700 378 37701-37800 379 37801-37900 380 37901-38000 381 38001-38100 382 38101-38200 383 38201-38300 384 38301-38400 385 38401-38500 386 38501-38600 387 38601-38700 388 38701-38800 389 38801-38900 390 38901-39000 391 39001-39100 392 39101-39200 393 39201-39300 394 39301-39400 395 39401-39500 396 39501-39600 397 39601-39700 398 39701-39800 399 39801-39900 400 39901-40000 401 40001-40100 402 40101-40200 403 40201-40300 404 40301-40400 405 40401-40500 406 40501-40600 407 40601-40700 408 40701-40800 409 40801-40900 410 40901-41000 411 41001-41100 412 41101-41200 413 41201-41300 414 41301-41400 415 41401-41500 416 41501-41600 417 41601-41700 418 41701-41800 419 41801-41900 420 41901-42000 421 42001-42100 422 42101-42200 423 42201-42300 424 42301-42400 425 42401-42500 426 42501-42600 427 42601-42700 428 42701-42800 429 42801-42900 430 42901-43000 431 43001-43100 432 43101-43200 433 43201-43300 434 43301-43400 435 43401-43457
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