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Theorem efgsfo 18925
 Description: For any word, there is a sequence of extensions starting at a reduced word and ending at the target word, such that each word in the chain is an extension of the previous (inserting an element and its inverse at adjacent indices somewhere in the sequence). (Contributed by Mario Carneiro, 27-Sep-2015.)
Hypotheses
Ref Expression
efgval.w 𝑊 = ( I ‘Word (𝐼 × 2o))
efgval.r = ( ~FG𝐼)
efgval2.m 𝑀 = (𝑦𝐼, 𝑧 ∈ 2o ↦ ⟨𝑦, (1o𝑧)⟩)
efgval2.t 𝑇 = (𝑣𝑊 ↦ (𝑛 ∈ (0...(♯‘𝑣)), 𝑤 ∈ (𝐼 × 2o) ↦ (𝑣 splice ⟨𝑛, 𝑛, ⟨“𝑤(𝑀𝑤)”⟩⟩)))
efgred.d 𝐷 = (𝑊 𝑥𝑊 ran (𝑇𝑥))
efgred.s 𝑆 = (𝑚 ∈ {𝑡 ∈ (Word 𝑊 ∖ {∅}) ∣ ((𝑡‘0) ∈ 𝐷 ∧ ∀𝑘 ∈ (1..^(♯‘𝑡))(𝑡𝑘) ∈ ran (𝑇‘(𝑡‘(𝑘 − 1))))} ↦ (𝑚‘((♯‘𝑚) − 1)))
Assertion
Ref Expression
efgsfo 𝑆:dom 𝑆onto𝑊
Distinct variable groups:   𝑦,𝑧   𝑡,𝑛,𝑣,𝑤,𝑦,𝑧,𝑚,𝑥   𝑚,𝑀   𝑥,𝑛,𝑀,𝑡,𝑣,𝑤   𝑘,𝑚,𝑡,𝑥,𝑇   𝑘,𝑛,𝑣,𝑤,𝑦,𝑧,𝑊,𝑚,𝑡,𝑥   ,𝑚,𝑡,𝑥,𝑦,𝑧   𝑚,𝐼,𝑛,𝑡,𝑣,𝑤,𝑥,𝑦,𝑧   𝐷,𝑚,𝑡
Allowed substitution hints:   𝐷(𝑥,𝑦,𝑧,𝑤,𝑣,𝑘,𝑛)   (𝑤,𝑣,𝑘,𝑛)   𝑆(𝑥,𝑦,𝑧,𝑤,𝑣,𝑡,𝑘,𝑚,𝑛)   𝑇(𝑦,𝑧,𝑤,𝑣,𝑛)   𝐼(𝑘)   𝑀(𝑦,𝑧,𝑘)

Proof of Theorem efgsfo
Dummy variables 𝑎 𝑏 𝑐 𝑑 𝑖 𝑜 are mutually distinct and distinct from all other variables.
StepHypRef Expression
1 efgval.w . . . 4 𝑊 = ( I ‘Word (𝐼 × 2o))
2 efgval.r . . . 4 = ( ~FG𝐼)
3 efgval2.m . . . 4 𝑀 = (𝑦𝐼, 𝑧 ∈ 2o ↦ ⟨𝑦, (1o𝑧)⟩)
4 efgval2.t . . . 4 𝑇 = (𝑣𝑊 ↦ (𝑛 ∈ (0...(♯‘𝑣)), 𝑤 ∈ (𝐼 × 2o) ↦ (𝑣 splice ⟨𝑛, 𝑛, ⟨“𝑤(𝑀𝑤)”⟩⟩)))
5 efgred.d . . . 4 𝐷 = (𝑊 𝑥𝑊 ran (𝑇𝑥))
6 efgred.s . . . 4 𝑆 = (𝑚 ∈ {𝑡 ∈ (Word 𝑊 ∖ {∅}) ∣ ((𝑡‘0) ∈ 𝐷 ∧ ∀𝑘 ∈ (1..^(♯‘𝑡))(𝑡𝑘) ∈ ran (𝑇‘(𝑡‘(𝑘 − 1))))} ↦ (𝑚‘((♯‘𝑚) − 1)))
71, 2, 3, 4, 5, 6efgsf 18915 . . 3 𝑆:{𝑡 ∈ (Word 𝑊 ∖ {∅}) ∣ ((𝑡‘0) ∈ 𝐷 ∧ ∀𝑘 ∈ (1..^(♯‘𝑡))(𝑡𝑘) ∈ ran (𝑇‘(𝑡‘(𝑘 − 1))))}⟶𝑊
87fdmi 6510 . . . 4 dom 𝑆 = {𝑡 ∈ (Word 𝑊 ∖ {∅}) ∣ ((𝑡‘0) ∈ 𝐷 ∧ ∀𝑘 ∈ (1..^(♯‘𝑡))(𝑡𝑘) ∈ ran (𝑇‘(𝑡‘(𝑘 − 1))))}
98feq2i 6491 . . 3 (𝑆:dom 𝑆𝑊𝑆:{𝑡 ∈ (Word 𝑊 ∖ {∅}) ∣ ((𝑡‘0) ∈ 𝐷 ∧ ∀𝑘 ∈ (1..^(♯‘𝑡))(𝑡𝑘) ∈ ran (𝑇‘(𝑡‘(𝑘 − 1))))}⟶𝑊)
107, 9mpbir 234 . 2 𝑆:dom 𝑆𝑊
11 frn 6505 . . . 4 (𝑆:dom 𝑆𝑊 → ran 𝑆𝑊)
1210, 11ax-mp 5 . . 3 ran 𝑆𝑊
13 fviss 6730 . . . . . . . . 9 ( I ‘Word (𝐼 × 2o)) ⊆ Word (𝐼 × 2o)
141, 13eqsstri 3927 . . . . . . . 8 𝑊 ⊆ Word (𝐼 × 2o)
1514sseli 3889 . . . . . . 7 (𝑐𝑊𝑐 ∈ Word (𝐼 × 2o))
16 lencl 13925 . . . . . . 7 (𝑐 ∈ Word (𝐼 × 2o) → (♯‘𝑐) ∈ ℕ0)
1715, 16syl 17 . . . . . 6 (𝑐𝑊 → (♯‘𝑐) ∈ ℕ0)
18 peano2nn0 11967 . . . . . 6 ((♯‘𝑐) ∈ ℕ0 → ((♯‘𝑐) + 1) ∈ ℕ0)
1914sseli 3889 . . . . . . . . . . . 12 (𝑎𝑊𝑎 ∈ Word (𝐼 × 2o))
20 lencl 13925 . . . . . . . . . . . 12 (𝑎 ∈ Word (𝐼 × 2o) → (♯‘𝑎) ∈ ℕ0)
2119, 20syl 17 . . . . . . . . . . 11 (𝑎𝑊 → (♯‘𝑎) ∈ ℕ0)
22 nn0nlt0 11953 . . . . . . . . . . . 12 ((♯‘𝑎) ∈ ℕ0 → ¬ (♯‘𝑎) < 0)
23 breq2 5037 . . . . . . . . . . . . 13 (𝑏 = 0 → ((♯‘𝑎) < 𝑏 ↔ (♯‘𝑎) < 0))
2423notbid 322 . . . . . . . . . . . 12 (𝑏 = 0 → (¬ (♯‘𝑎) < 𝑏 ↔ ¬ (♯‘𝑎) < 0))
2522, 24syl5ibr 249 . . . . . . . . . . 11 (𝑏 = 0 → ((♯‘𝑎) ∈ ℕ0 → ¬ (♯‘𝑎) < 𝑏))
2621, 25syl5 34 . . . . . . . . . 10 (𝑏 = 0 → (𝑎𝑊 → ¬ (♯‘𝑎) < 𝑏))
2726ralrimiv 3113 . . . . . . . . 9 (𝑏 = 0 → ∀𝑎𝑊 ¬ (♯‘𝑎) < 𝑏)
28 rabeq0 4281 . . . . . . . . 9 ({𝑎𝑊 ∣ (♯‘𝑎) < 𝑏} = ∅ ↔ ∀𝑎𝑊 ¬ (♯‘𝑎) < 𝑏)
2927, 28sylibr 237 . . . . . . . 8 (𝑏 = 0 → {𝑎𝑊 ∣ (♯‘𝑎) < 𝑏} = ∅)
3029sseq1d 3924 . . . . . . 7 (𝑏 = 0 → ({𝑎𝑊 ∣ (♯‘𝑎) < 𝑏} ⊆ ran 𝑆 ↔ ∅ ⊆ ran 𝑆))
31 breq2 5037 . . . . . . . . 9 (𝑏 = 𝑑 → ((♯‘𝑎) < 𝑏 ↔ (♯‘𝑎) < 𝑑))
3231rabbidv 3393 . . . . . . . 8 (𝑏 = 𝑑 → {𝑎𝑊 ∣ (♯‘𝑎) < 𝑏} = {𝑎𝑊 ∣ (♯‘𝑎) < 𝑑})
3332sseq1d 3924 . . . . . . 7 (𝑏 = 𝑑 → ({𝑎𝑊 ∣ (♯‘𝑎) < 𝑏} ⊆ ran 𝑆 ↔ {𝑎𝑊 ∣ (♯‘𝑎) < 𝑑} ⊆ ran 𝑆))
34 breq2 5037 . . . . . . . . 9 (𝑏 = (𝑑 + 1) → ((♯‘𝑎) < 𝑏 ↔ (♯‘𝑎) < (𝑑 + 1)))
3534rabbidv 3393 . . . . . . . 8 (𝑏 = (𝑑 + 1) → {𝑎𝑊 ∣ (♯‘𝑎) < 𝑏} = {𝑎𝑊 ∣ (♯‘𝑎) < (𝑑 + 1)})
3635sseq1d 3924 . . . . . . 7 (𝑏 = (𝑑 + 1) → ({𝑎𝑊 ∣ (♯‘𝑎) < 𝑏} ⊆ ran 𝑆 ↔ {𝑎𝑊 ∣ (♯‘𝑎) < (𝑑 + 1)} ⊆ ran 𝑆))
37 breq2 5037 . . . . . . . . 9 (𝑏 = ((♯‘𝑐) + 1) → ((♯‘𝑎) < 𝑏 ↔ (♯‘𝑎) < ((♯‘𝑐) + 1)))
3837rabbidv 3393 . . . . . . . 8 (𝑏 = ((♯‘𝑐) + 1) → {𝑎𝑊 ∣ (♯‘𝑎) < 𝑏} = {𝑎𝑊 ∣ (♯‘𝑎) < ((♯‘𝑐) + 1)})
3938sseq1d 3924 . . . . . . 7 (𝑏 = ((♯‘𝑐) + 1) → ({𝑎𝑊 ∣ (♯‘𝑎) < 𝑏} ⊆ ran 𝑆 ↔ {𝑎𝑊 ∣ (♯‘𝑎) < ((♯‘𝑐) + 1)} ⊆ ran 𝑆))
40 0ss 4293 . . . . . . 7 ∅ ⊆ ran 𝑆
41 simpr 489 . . . . . . . . . 10 ((𝑑 ∈ ℕ0 ∧ {𝑎𝑊 ∣ (♯‘𝑎) < 𝑑} ⊆ ran 𝑆) → {𝑎𝑊 ∣ (♯‘𝑎) < 𝑑} ⊆ ran 𝑆)
42 fveqeq2 6668 . . . . . . . . . . . 12 (𝑎 = 𝑐 → ((♯‘𝑎) = 𝑑 ↔ (♯‘𝑐) = 𝑑))
4342cbvrabv 3405 . . . . . . . . . . 11 {𝑎𝑊 ∣ (♯‘𝑎) = 𝑑} = {𝑐𝑊 ∣ (♯‘𝑐) = 𝑑}
44 eliun 4888 . . . . . . . . . . . . . . 15 (𝑐 𝑥𝑊 ran (𝑇𝑥) ↔ ∃𝑥𝑊 𝑐 ∈ ran (𝑇𝑥))
45 fveq2 6659 . . . . . . . . . . . . . . . . . 18 (𝑥 = 𝑏 → (𝑇𝑥) = (𝑇𝑏))
4645rneqd 5780 . . . . . . . . . . . . . . . . 17 (𝑥 = 𝑏 → ran (𝑇𝑥) = ran (𝑇𝑏))
4746eleq2d 2838 . . . . . . . . . . . . . . . 16 (𝑥 = 𝑏 → (𝑐 ∈ ran (𝑇𝑥) ↔ 𝑐 ∈ ran (𝑇𝑏)))
4847cbvrexvw 3363 . . . . . . . . . . . . . . 15 (∃𝑥𝑊 𝑐 ∈ ran (𝑇𝑥) ↔ ∃𝑏𝑊 𝑐 ∈ ran (𝑇𝑏))
4944, 48bitri 278 . . . . . . . . . . . . . 14 (𝑐 𝑥𝑊 ran (𝑇𝑥) ↔ ∃𝑏𝑊 𝑐 ∈ ran (𝑇𝑏))
50 simpl1r 1223 . . . . . . . . . . . . . . . . . 18 ((((𝑑 ∈ ℕ0 ∧ {𝑎𝑊 ∣ (♯‘𝑎) < 𝑑} ⊆ ran 𝑆) ∧ 𝑐𝑊 ∧ (♯‘𝑐) = 𝑑) ∧ (𝑏𝑊𝑐 ∈ ran (𝑇𝑏))) → {𝑎𝑊 ∣ (♯‘𝑎) < 𝑑} ⊆ ran 𝑆)
51 fveq2 6659 . . . . . . . . . . . . . . . . . . . 20 (𝑎 = 𝑏 → (♯‘𝑎) = (♯‘𝑏))
5251breq1d 5043 . . . . . . . . . . . . . . . . . . 19 (𝑎 = 𝑏 → ((♯‘𝑎) < 𝑑 ↔ (♯‘𝑏) < 𝑑))
53 simprl 771 . . . . . . . . . . . . . . . . . . 19 ((((𝑑 ∈ ℕ0 ∧ {𝑎𝑊 ∣ (♯‘𝑎) < 𝑑} ⊆ ran 𝑆) ∧ 𝑐𝑊 ∧ (♯‘𝑐) = 𝑑) ∧ (𝑏𝑊𝑐 ∈ ran (𝑇𝑏))) → 𝑏𝑊)
5414, 53sseldi 3891 . . . . . . . . . . . . . . . . . . . . . . 23 ((((𝑑 ∈ ℕ0 ∧ {𝑎𝑊 ∣ (♯‘𝑎) < 𝑑} ⊆ ran 𝑆) ∧ 𝑐𝑊 ∧ (♯‘𝑐) = 𝑑) ∧ (𝑏𝑊𝑐 ∈ ran (𝑇𝑏))) → 𝑏 ∈ Word (𝐼 × 2o))
55 lencl 13925 . . . . . . . . . . . . . . . . . . . . . . 23 (𝑏 ∈ Word (𝐼 × 2o) → (♯‘𝑏) ∈ ℕ0)
5654, 55syl 17 . . . . . . . . . . . . . . . . . . . . . 22 ((((𝑑 ∈ ℕ0 ∧ {𝑎𝑊 ∣ (♯‘𝑎) < 𝑑} ⊆ ran 𝑆) ∧ 𝑐𝑊 ∧ (♯‘𝑐) = 𝑑) ∧ (𝑏𝑊𝑐 ∈ ran (𝑇𝑏))) → (♯‘𝑏) ∈ ℕ0)
5756nn0red 11988 . . . . . . . . . . . . . . . . . . . . 21 ((((𝑑 ∈ ℕ0 ∧ {𝑎𝑊 ∣ (♯‘𝑎) < 𝑑} ⊆ ran 𝑆) ∧ 𝑐𝑊 ∧ (♯‘𝑐) = 𝑑) ∧ (𝑏𝑊𝑐 ∈ ran (𝑇𝑏))) → (♯‘𝑏) ∈ ℝ)
58 2rp 12428 . . . . . . . . . . . . . . . . . . . . 21 2 ∈ ℝ+
59 ltaddrp 12460 . . . . . . . . . . . . . . . . . . . . 21 (((♯‘𝑏) ∈ ℝ ∧ 2 ∈ ℝ+) → (♯‘𝑏) < ((♯‘𝑏) + 2))
6057, 58, 59sylancl 590 . . . . . . . . . . . . . . . . . . . 20 ((((𝑑 ∈ ℕ0 ∧ {𝑎𝑊 ∣ (♯‘𝑎) < 𝑑} ⊆ ran 𝑆) ∧ 𝑐𝑊 ∧ (♯‘𝑐) = 𝑑) ∧ (𝑏𝑊𝑐 ∈ ran (𝑇𝑏))) → (♯‘𝑏) < ((♯‘𝑏) + 2))
611, 2, 3, 4efgtlen 18912 . . . . . . . . . . . . . . . . . . . . . 22 ((𝑏𝑊𝑐 ∈ ran (𝑇𝑏)) → (♯‘𝑐) = ((♯‘𝑏) + 2))
6261adantl 486 . . . . . . . . . . . . . . . . . . . . 21 ((((𝑑 ∈ ℕ0 ∧ {𝑎𝑊 ∣ (♯‘𝑎) < 𝑑} ⊆ ran 𝑆) ∧ 𝑐𝑊 ∧ (♯‘𝑐) = 𝑑) ∧ (𝑏𝑊𝑐 ∈ ran (𝑇𝑏))) → (♯‘𝑐) = ((♯‘𝑏) + 2))
63 simpl3 1191 . . . . . . . . . . . . . . . . . . . . 21 ((((𝑑 ∈ ℕ0 ∧ {𝑎𝑊 ∣ (♯‘𝑎) < 𝑑} ⊆ ran 𝑆) ∧ 𝑐𝑊 ∧ (♯‘𝑐) = 𝑑) ∧ (𝑏𝑊𝑐 ∈ ran (𝑇𝑏))) → (♯‘𝑐) = 𝑑)
6462, 63eqtr3d 2796 . . . . . . . . . . . . . . . . . . . 20 ((((𝑑 ∈ ℕ0 ∧ {𝑎𝑊 ∣ (♯‘𝑎) < 𝑑} ⊆ ran 𝑆) ∧ 𝑐𝑊 ∧ (♯‘𝑐) = 𝑑) ∧ (𝑏𝑊𝑐 ∈ ran (𝑇𝑏))) → ((♯‘𝑏) + 2) = 𝑑)
6560, 64breqtrd 5059 . . . . . . . . . . . . . . . . . . 19 ((((𝑑 ∈ ℕ0 ∧ {𝑎𝑊 ∣ (♯‘𝑎) < 𝑑} ⊆ ran 𝑆) ∧ 𝑐𝑊 ∧ (♯‘𝑐) = 𝑑) ∧ (𝑏𝑊𝑐 ∈ ran (𝑇𝑏))) → (♯‘𝑏) < 𝑑)
6652, 53, 65elrabd 3605 . . . . . . . . . . . . . . . . . 18 ((((𝑑 ∈ ℕ0 ∧ {𝑎𝑊 ∣ (♯‘𝑎) < 𝑑} ⊆ ran 𝑆) ∧ 𝑐𝑊 ∧ (♯‘𝑐) = 𝑑) ∧ (𝑏𝑊𝑐 ∈ ran (𝑇𝑏))) → 𝑏 ∈ {𝑎𝑊 ∣ (♯‘𝑎) < 𝑑})
6750, 66sseldd 3894 . . . . . . . . . . . . . . . . 17 ((((𝑑 ∈ ℕ0 ∧ {𝑎𝑊 ∣ (♯‘𝑎) < 𝑑} ⊆ ran 𝑆) ∧ 𝑐𝑊 ∧ (♯‘𝑐) = 𝑑) ∧ (𝑏𝑊𝑐 ∈ ran (𝑇𝑏))) → 𝑏 ∈ ran 𝑆)
68 ffn 6499 . . . . . . . . . . . . . . . . . . 19 (𝑆:dom 𝑆𝑊𝑆 Fn dom 𝑆)
6910, 68ax-mp 5 . . . . . . . . . . . . . . . . . 18 𝑆 Fn dom 𝑆
70 fvelrnb 6715 . . . . . . . . . . . . . . . . . 18 (𝑆 Fn dom 𝑆 → (𝑏 ∈ ran 𝑆 ↔ ∃𝑜 ∈ dom 𝑆(𝑆𝑜) = 𝑏))
7169, 70ax-mp 5 . . . . . . . . . . . . . . . . 17 (𝑏 ∈ ran 𝑆 ↔ ∃𝑜 ∈ dom 𝑆(𝑆𝑜) = 𝑏)
7267, 71sylib 221 . . . . . . . . . . . . . . . 16 ((((𝑑 ∈ ℕ0 ∧ {𝑎𝑊 ∣ (♯‘𝑎) < 𝑑} ⊆ ran 𝑆) ∧ 𝑐𝑊 ∧ (♯‘𝑐) = 𝑑) ∧ (𝑏𝑊𝑐 ∈ ran (𝑇𝑏))) → ∃𝑜 ∈ dom 𝑆(𝑆𝑜) = 𝑏)
73 simprrl 781 . . . . . . . . . . . . . . . . . . . 20 ((((𝑑 ∈ ℕ0 ∧ {𝑎𝑊 ∣ (♯‘𝑎) < 𝑑} ⊆ ran 𝑆) ∧ 𝑐𝑊 ∧ (♯‘𝑐) = 𝑑) ∧ ((𝑏𝑊𝑐 ∈ ran (𝑇𝑏)) ∧ (𝑜 ∈ dom 𝑆 ∧ (𝑆𝑜) = 𝑏))) → 𝑜 ∈ dom 𝑆)
741, 2, 3, 4, 5, 6efgsdm 18916 . . . . . . . . . . . . . . . . . . . . 21 (𝑜 ∈ dom 𝑆 ↔ (𝑜 ∈ (Word 𝑊 ∖ {∅}) ∧ (𝑜‘0) ∈ 𝐷 ∧ ∀𝑖 ∈ (1..^(♯‘𝑜))(𝑜𝑖) ∈ ran (𝑇‘(𝑜‘(𝑖 − 1)))))
7574simp1bi 1143 . . . . . . . . . . . . . . . . . . . 20 (𝑜 ∈ dom 𝑆𝑜 ∈ (Word 𝑊 ∖ {∅}))
76 eldifi 4033 . . . . . . . . . . . . . . . . . . . 20 (𝑜 ∈ (Word 𝑊 ∖ {∅}) → 𝑜 ∈ Word 𝑊)
7773, 75, 763syl 18 . . . . . . . . . . . . . . . . . . 19 ((((𝑑 ∈ ℕ0 ∧ {𝑎𝑊 ∣ (♯‘𝑎) < 𝑑} ⊆ ran 𝑆) ∧ 𝑐𝑊 ∧ (♯‘𝑐) = 𝑑) ∧ ((𝑏𝑊𝑐 ∈ ran (𝑇𝑏)) ∧ (𝑜 ∈ dom 𝑆 ∧ (𝑆𝑜) = 𝑏))) → 𝑜 ∈ Word 𝑊)
78 simpl2 1190 . . . . . . . . . . . . . . . . . . 19 ((((𝑑 ∈ ℕ0 ∧ {𝑎𝑊 ∣ (♯‘𝑎) < 𝑑} ⊆ ran 𝑆) ∧ 𝑐𝑊 ∧ (♯‘𝑐) = 𝑑) ∧ ((𝑏𝑊𝑐 ∈ ran (𝑇𝑏)) ∧ (𝑜 ∈ dom 𝑆 ∧ (𝑆𝑜) = 𝑏))) → 𝑐𝑊)
79 simprlr 780 . . . . . . . . . . . . . . . . . . . . 21 ((((𝑑 ∈ ℕ0 ∧ {𝑎𝑊 ∣ (♯‘𝑎) < 𝑑} ⊆ ran 𝑆) ∧ 𝑐𝑊 ∧ (♯‘𝑐) = 𝑑) ∧ ((𝑏𝑊𝑐 ∈ ran (𝑇𝑏)) ∧ (𝑜 ∈ dom 𝑆 ∧ (𝑆𝑜) = 𝑏))) → 𝑐 ∈ ran (𝑇𝑏))
80 simprrr 782 . . . . . . . . . . . . . . . . . . . . . . 23 ((((𝑑 ∈ ℕ0 ∧ {𝑎𝑊 ∣ (♯‘𝑎) < 𝑑} ⊆ ran 𝑆) ∧ 𝑐𝑊 ∧ (♯‘𝑐) = 𝑑) ∧ ((𝑏𝑊𝑐 ∈ ran (𝑇𝑏)) ∧ (𝑜 ∈ dom 𝑆 ∧ (𝑆𝑜) = 𝑏))) → (𝑆𝑜) = 𝑏)
8180fveq2d 6663 . . . . . . . . . . . . . . . . . . . . . 22 ((((𝑑 ∈ ℕ0 ∧ {𝑎𝑊 ∣ (♯‘𝑎) < 𝑑} ⊆ ran 𝑆) ∧ 𝑐𝑊 ∧ (♯‘𝑐) = 𝑑) ∧ ((𝑏𝑊𝑐 ∈ ran (𝑇𝑏)) ∧ (𝑜 ∈ dom 𝑆 ∧ (𝑆𝑜) = 𝑏))) → (𝑇‘(𝑆𝑜)) = (𝑇𝑏))
8281rneqd 5780 . . . . . . . . . . . . . . . . . . . . 21 ((((𝑑 ∈ ℕ0 ∧ {𝑎𝑊 ∣ (♯‘𝑎) < 𝑑} ⊆ ran 𝑆) ∧ 𝑐𝑊 ∧ (♯‘𝑐) = 𝑑) ∧ ((𝑏𝑊𝑐 ∈ ran (𝑇𝑏)) ∧ (𝑜 ∈ dom 𝑆 ∧ (𝑆𝑜) = 𝑏))) → ran (𝑇‘(𝑆𝑜)) = ran (𝑇𝑏))
8379, 82eleqtrrd 2856 . . . . . . . . . . . . . . . . . . . 20 ((((𝑑 ∈ ℕ0 ∧ {𝑎𝑊 ∣ (♯‘𝑎) < 𝑑} ⊆ ran 𝑆) ∧ 𝑐𝑊 ∧ (♯‘𝑐) = 𝑑) ∧ ((𝑏𝑊𝑐 ∈ ran (𝑇𝑏)) ∧ (𝑜 ∈ dom 𝑆 ∧ (𝑆𝑜) = 𝑏))) → 𝑐 ∈ ran (𝑇‘(𝑆𝑜)))
841, 2, 3, 4, 5, 6efgsp1 18923 . . . . . . . . . . . . . . . . . . . 20 ((𝑜 ∈ dom 𝑆𝑐 ∈ ran (𝑇‘(𝑆𝑜))) → (𝑜 ++ ⟨“𝑐”⟩) ∈ dom 𝑆)
8573, 83, 84syl2anc 588 . . . . . . . . . . . . . . . . . . 19 ((((𝑑 ∈ ℕ0 ∧ {𝑎𝑊 ∣ (♯‘𝑎) < 𝑑} ⊆ ran 𝑆) ∧ 𝑐𝑊 ∧ (♯‘𝑐) = 𝑑) ∧ ((𝑏𝑊𝑐 ∈ ran (𝑇𝑏)) ∧ (𝑜 ∈ dom 𝑆 ∧ (𝑆𝑜) = 𝑏))) → (𝑜 ++ ⟨“𝑐”⟩) ∈ dom 𝑆)
861, 2, 3, 4, 5, 6efgsval2 18919 . . . . . . . . . . . . . . . . . . 19 ((𝑜 ∈ Word 𝑊𝑐𝑊 ∧ (𝑜 ++ ⟨“𝑐”⟩) ∈ dom 𝑆) → (𝑆‘(𝑜 ++ ⟨“𝑐”⟩)) = 𝑐)
8777, 78, 85, 86syl3anc 1369 . . . . . . . . . . . . . . . . . 18 ((((𝑑 ∈ ℕ0 ∧ {𝑎𝑊 ∣ (♯‘𝑎) < 𝑑} ⊆ ran 𝑆) ∧ 𝑐𝑊 ∧ (♯‘𝑐) = 𝑑) ∧ ((𝑏𝑊𝑐 ∈ ran (𝑇𝑏)) ∧ (𝑜 ∈ dom 𝑆 ∧ (𝑆𝑜) = 𝑏))) → (𝑆‘(𝑜 ++ ⟨“𝑐”⟩)) = 𝑐)
88 fnfvelrn 6840 . . . . . . . . . . . . . . . . . . 19 ((𝑆 Fn dom 𝑆 ∧ (𝑜 ++ ⟨“𝑐”⟩) ∈ dom 𝑆) → (𝑆‘(𝑜 ++ ⟨“𝑐”⟩)) ∈ ran 𝑆)
8969, 85, 88sylancr 591 . . . . . . . . . . . . . . . . . 18 ((((𝑑 ∈ ℕ0 ∧ {𝑎𝑊 ∣ (♯‘𝑎) < 𝑑} ⊆ ran 𝑆) ∧ 𝑐𝑊 ∧ (♯‘𝑐) = 𝑑) ∧ ((𝑏𝑊𝑐 ∈ ran (𝑇𝑏)) ∧ (𝑜 ∈ dom 𝑆 ∧ (𝑆𝑜) = 𝑏))) → (𝑆‘(𝑜 ++ ⟨“𝑐”⟩)) ∈ ran 𝑆)
9087, 89eqeltrrd 2854 . . . . . . . . . . . . . . . . 17 ((((𝑑 ∈ ℕ0 ∧ {𝑎𝑊 ∣ (♯‘𝑎) < 𝑑} ⊆ ran 𝑆) ∧ 𝑐𝑊 ∧ (♯‘𝑐) = 𝑑) ∧ ((𝑏𝑊𝑐 ∈ ran (𝑇𝑏)) ∧ (𝑜 ∈ dom 𝑆 ∧ (𝑆𝑜) = 𝑏))) → 𝑐 ∈ ran 𝑆)
9190anassrs 472 . . . . . . . . . . . . . . . 16 (((((𝑑 ∈ ℕ0 ∧ {𝑎𝑊 ∣ (♯‘𝑎) < 𝑑} ⊆ ran 𝑆) ∧ 𝑐𝑊 ∧ (♯‘𝑐) = 𝑑) ∧ (𝑏𝑊𝑐 ∈ ran (𝑇𝑏))) ∧ (𝑜 ∈ dom 𝑆 ∧ (𝑆𝑜) = 𝑏)) → 𝑐 ∈ ran 𝑆)
9272, 91rexlimddv 3216 . . . . . . . . . . . . . . 15 ((((𝑑 ∈ ℕ0 ∧ {𝑎𝑊 ∣ (♯‘𝑎) < 𝑑} ⊆ ran 𝑆) ∧ 𝑐𝑊 ∧ (♯‘𝑐) = 𝑑) ∧ (𝑏𝑊𝑐 ∈ ran (𝑇𝑏))) → 𝑐 ∈ ran 𝑆)
9392rexlimdvaa 3210 . . . . . . . . . . . . . 14 (((𝑑 ∈ ℕ0 ∧ {𝑎𝑊 ∣ (♯‘𝑎) < 𝑑} ⊆ ran 𝑆) ∧ 𝑐𝑊 ∧ (♯‘𝑐) = 𝑑) → (∃𝑏𝑊 𝑐 ∈ ran (𝑇𝑏) → 𝑐 ∈ ran 𝑆))
9449, 93syl5bi 245 . . . . . . . . . . . . 13 (((𝑑 ∈ ℕ0 ∧ {𝑎𝑊 ∣ (♯‘𝑎) < 𝑑} ⊆ ran 𝑆) ∧ 𝑐𝑊 ∧ (♯‘𝑐) = 𝑑) → (𝑐 𝑥𝑊 ran (𝑇𝑥) → 𝑐 ∈ ran 𝑆))
95 eldif 3869 . . . . . . . . . . . . . . . . . . 19 (𝑐 ∈ (𝑊 𝑥𝑊 ran (𝑇𝑥)) ↔ (𝑐𝑊 ∧ ¬ 𝑐 𝑥𝑊 ran (𝑇𝑥)))
965eleq2i 2844 . . . . . . . . . . . . . . . . . . . 20 (𝑐𝐷𝑐 ∈ (𝑊 𝑥𝑊 ran (𝑇𝑥)))
971, 2, 3, 4, 5, 6efgs1 18921 . . . . . . . . . . . . . . . . . . . 20 (𝑐𝐷 → ⟨“𝑐”⟩ ∈ dom 𝑆)
9896, 97sylbir 238 . . . . . . . . . . . . . . . . . . 19 (𝑐 ∈ (𝑊 𝑥𝑊 ran (𝑇𝑥)) → ⟨“𝑐”⟩ ∈ dom 𝑆)
9995, 98sylbir 238 . . . . . . . . . . . . . . . . . 18 ((𝑐𝑊 ∧ ¬ 𝑐 𝑥𝑊 ran (𝑇𝑥)) → ⟨“𝑐”⟩ ∈ dom 𝑆)
1001, 2, 3, 4, 5, 6efgsval 18917 . . . . . . . . . . . . . . . . . 18 (⟨“𝑐”⟩ ∈ dom 𝑆 → (𝑆‘⟨“𝑐”⟩) = (⟨“𝑐”⟩‘((♯‘⟨“𝑐”⟩) − 1)))
10199, 100syl 17 . . . . . . . . . . . . . . . . 17 ((𝑐𝑊 ∧ ¬ 𝑐 𝑥𝑊 ran (𝑇𝑥)) → (𝑆‘⟨“𝑐”⟩) = (⟨“𝑐”⟩‘((♯‘⟨“𝑐”⟩) − 1)))
102 s1len 14000 . . . . . . . . . . . . . . . . . . . . 21 (♯‘⟨“𝑐”⟩) = 1
103102oveq1i 7161 . . . . . . . . . . . . . . . . . . . 20 ((♯‘⟨“𝑐”⟩) − 1) = (1 − 1)
104 1m1e0 11739 . . . . . . . . . . . . . . . . . . . 20 (1 − 1) = 0
105103, 104eqtri 2782 . . . . . . . . . . . . . . . . . . 19 ((♯‘⟨“𝑐”⟩) − 1) = 0
106105fveq2i 6662 . . . . . . . . . . . . . . . . . 18 (⟨“𝑐”⟩‘((♯‘⟨“𝑐”⟩) − 1)) = (⟨“𝑐”⟩‘0)
107106a1i 11 . . . . . . . . . . . . . . . . 17 ((𝑐𝑊 ∧ ¬ 𝑐 𝑥𝑊 ran (𝑇𝑥)) → (⟨“𝑐”⟩‘((♯‘⟨“𝑐”⟩) − 1)) = (⟨“𝑐”⟩‘0))
108 s1fv 14004 . . . . . . . . . . . . . . . . . 18 (𝑐𝑊 → (⟨“𝑐”⟩‘0) = 𝑐)
109108adantr 485 . . . . . . . . . . . . . . . . 17 ((𝑐𝑊 ∧ ¬ 𝑐 𝑥𝑊 ran (𝑇𝑥)) → (⟨“𝑐”⟩‘0) = 𝑐)
110101, 107, 1093eqtrd 2798 . . . . . . . . . . . . . . . 16 ((𝑐𝑊 ∧ ¬ 𝑐 𝑥𝑊 ran (𝑇𝑥)) → (𝑆‘⟨“𝑐”⟩) = 𝑐)
111 fnfvelrn 6840 . . . . . . . . . . . . . . . . 17 ((𝑆 Fn dom 𝑆 ∧ ⟨“𝑐”⟩ ∈ dom 𝑆) → (𝑆‘⟨“𝑐”⟩) ∈ ran 𝑆)
11269, 99, 111sylancr 591 . . . . . . . . . . . . . . . 16 ((𝑐𝑊 ∧ ¬ 𝑐 𝑥𝑊 ran (𝑇𝑥)) → (𝑆‘⟨“𝑐”⟩) ∈ ran 𝑆)
113110, 112eqeltrrd 2854 . . . . . . . . . . . . . . 15 ((𝑐𝑊 ∧ ¬ 𝑐 𝑥𝑊 ran (𝑇𝑥)) → 𝑐 ∈ ran 𝑆)
114113ex 417 . . . . . . . . . . . . . 14 (𝑐𝑊 → (¬ 𝑐 𝑥𝑊 ran (𝑇𝑥) → 𝑐 ∈ ran 𝑆))
1151143ad2ant2 1132 . . . . . . . . . . . . 13 (((𝑑 ∈ ℕ0 ∧ {𝑎𝑊 ∣ (♯‘𝑎) < 𝑑} ⊆ ran 𝑆) ∧ 𝑐𝑊 ∧ (♯‘𝑐) = 𝑑) → (¬ 𝑐 𝑥𝑊 ran (𝑇𝑥) → 𝑐 ∈ ran 𝑆))
11694, 115pm2.61d 182 . . . . . . . . . . . 12 (((𝑑 ∈ ℕ0 ∧ {𝑎𝑊 ∣ (♯‘𝑎) < 𝑑} ⊆ ran 𝑆) ∧ 𝑐𝑊 ∧ (♯‘𝑐) = 𝑑) → 𝑐 ∈ ran 𝑆)
117116rabssdv 3980 . . . . . . . . . . 11 ((𝑑 ∈ ℕ0 ∧ {𝑎𝑊 ∣ (♯‘𝑎) < 𝑑} ⊆ ran 𝑆) → {𝑐𝑊 ∣ (♯‘𝑐) = 𝑑} ⊆ ran 𝑆)
11843, 117eqsstrid 3941 . . . . . . . . . 10 ((𝑑 ∈ ℕ0 ∧ {𝑎𝑊 ∣ (♯‘𝑎) < 𝑑} ⊆ ran 𝑆) → {𝑎𝑊 ∣ (♯‘𝑎) = 𝑑} ⊆ ran 𝑆)
11941, 118unssd 4092 . . . . . . . . 9 ((𝑑 ∈ ℕ0 ∧ {𝑎𝑊 ∣ (♯‘𝑎) < 𝑑} ⊆ ran 𝑆) → ({𝑎𝑊 ∣ (♯‘𝑎) < 𝑑} ∪ {𝑎𝑊 ∣ (♯‘𝑎) = 𝑑}) ⊆ ran 𝑆)
120119ex 417 . . . . . . . 8 (𝑑 ∈ ℕ0 → ({𝑎𝑊 ∣ (♯‘𝑎) < 𝑑} ⊆ ran 𝑆 → ({𝑎𝑊 ∣ (♯‘𝑎) < 𝑑} ∪ {𝑎𝑊 ∣ (♯‘𝑎) = 𝑑}) ⊆ ran 𝑆))
121 id 22 . . . . . . . . . . . . 13 (𝑑 ∈ ℕ0𝑑 ∈ ℕ0)
122 nn0leltp1 12073 . . . . . . . . . . . . 13 (((♯‘𝑎) ∈ ℕ0𝑑 ∈ ℕ0) → ((♯‘𝑎) ≤ 𝑑 ↔ (♯‘𝑎) < (𝑑 + 1)))
12321, 121, 122syl2anr 600 . . . . . . . . . . . 12 ((𝑑 ∈ ℕ0𝑎𝑊) → ((♯‘𝑎) ≤ 𝑑 ↔ (♯‘𝑎) < (𝑑 + 1)))
12421nn0red 11988 . . . . . . . . . . . . 13 (𝑎𝑊 → (♯‘𝑎) ∈ ℝ)
125 nn0re 11936 . . . . . . . . . . . . 13 (𝑑 ∈ ℕ0𝑑 ∈ ℝ)
126 leloe 10758 . . . . . . . . . . . . 13 (((♯‘𝑎) ∈ ℝ ∧ 𝑑 ∈ ℝ) → ((♯‘𝑎) ≤ 𝑑 ↔ ((♯‘𝑎) < 𝑑 ∨ (♯‘𝑎) = 𝑑)))
127124, 125, 126syl2anr 600 . . . . . . . . . . . 12 ((𝑑 ∈ ℕ0𝑎𝑊) → ((♯‘𝑎) ≤ 𝑑 ↔ ((♯‘𝑎) < 𝑑 ∨ (♯‘𝑎) = 𝑑)))
128123, 127bitr3d 284 . . . . . . . . . . 11 ((𝑑 ∈ ℕ0𝑎𝑊) → ((♯‘𝑎) < (𝑑 + 1) ↔ ((♯‘𝑎) < 𝑑 ∨ (♯‘𝑎) = 𝑑)))
129128rabbidva 3391 . . . . . . . . . 10 (𝑑 ∈ ℕ0 → {𝑎𝑊 ∣ (♯‘𝑎) < (𝑑 + 1)} = {𝑎𝑊 ∣ ((♯‘𝑎) < 𝑑 ∨ (♯‘𝑎) = 𝑑)})
130 unrab 4209 . . . . . . . . . 10 ({𝑎𝑊 ∣ (♯‘𝑎) < 𝑑} ∪ {𝑎𝑊 ∣ (♯‘𝑎) = 𝑑}) = {𝑎𝑊 ∣ ((♯‘𝑎) < 𝑑 ∨ (♯‘𝑎) = 𝑑)}
131129, 130eqtr4di 2812 . . . . . . . . 9 (𝑑 ∈ ℕ0 → {𝑎𝑊 ∣ (♯‘𝑎) < (𝑑 + 1)} = ({𝑎𝑊 ∣ (♯‘𝑎) < 𝑑} ∪ {𝑎𝑊 ∣ (♯‘𝑎) = 𝑑}))
132131sseq1d 3924 . . . . . . . 8 (𝑑 ∈ ℕ0 → ({𝑎𝑊 ∣ (♯‘𝑎) < (𝑑 + 1)} ⊆ ran 𝑆 ↔ ({𝑎𝑊 ∣ (♯‘𝑎) < 𝑑} ∪ {𝑎𝑊 ∣ (♯‘𝑎) = 𝑑}) ⊆ ran 𝑆))
133120, 132sylibrd 262 . . . . . . 7 (𝑑 ∈ ℕ0 → ({𝑎𝑊 ∣ (♯‘𝑎) < 𝑑} ⊆ ran 𝑆 → {𝑎𝑊 ∣ (♯‘𝑎) < (𝑑 + 1)} ⊆ ran 𝑆))
13430, 33, 36, 39, 40, 133nn0ind 12109 . . . . . 6 (((♯‘𝑐) + 1) ∈ ℕ0 → {𝑎𝑊 ∣ (♯‘𝑎) < ((♯‘𝑐) + 1)} ⊆ ran 𝑆)
13517, 18, 1343syl 18 . . . . 5 (𝑐𝑊 → {𝑎𝑊 ∣ (♯‘𝑎) < ((♯‘𝑐) + 1)} ⊆ ran 𝑆)
136 fveq2 6659 . . . . . . 7 (𝑎 = 𝑐 → (♯‘𝑎) = (♯‘𝑐))
137136breq1d 5043 . . . . . 6 (𝑎 = 𝑐 → ((♯‘𝑎) < ((♯‘𝑐) + 1) ↔ (♯‘𝑐) < ((♯‘𝑐) + 1)))
138 id 22 . . . . . 6 (𝑐𝑊𝑐𝑊)
13917nn0red 11988 . . . . . . 7 (𝑐𝑊 → (♯‘𝑐) ∈ ℝ)
140139ltp1d 11601 . . . . . 6 (𝑐𝑊 → (♯‘𝑐) < ((♯‘𝑐) + 1))
141137, 138, 140elrabd 3605 . . . . 5 (𝑐𝑊𝑐 ∈ {𝑎𝑊 ∣ (♯‘𝑎) < ((♯‘𝑐) + 1)})
142135, 141sseldd 3894 . . . 4 (𝑐𝑊𝑐 ∈ ran 𝑆)
143142ssriv 3897 . . 3 𝑊 ⊆ ran 𝑆
14412, 143eqssi 3909 . 2 ran 𝑆 = 𝑊
145 dffo2 6581 . 2 (𝑆:dom 𝑆onto𝑊 ↔ (𝑆:dom 𝑆𝑊 ∧ ran 𝑆 = 𝑊))
14610, 144, 145mpbir2an 711 1 𝑆:dom 𝑆onto𝑊
 Colors of variables: wff setvar class Syntax hints:  ¬ wn 3   → wi 4   ↔ wb 209   ∧ wa 400   ∨ wo 845   ∧ w3a 1085   = wceq 1539   ∈ wcel 2112  ∀wral 3071  ∃wrex 3072  {crab 3075   ∖ cdif 3856   ∪ cun 3857   ⊆ wss 3859  ∅c0 4226  {csn 4523  ⟨cop 4529  ⟨cotp 4531  ∪ ciun 4884   class class class wbr 5033   ↦ cmpt 5113   I cid 5430   × cxp 5523  dom cdm 5525  ran crn 5526   Fn wfn 6331  ⟶wf 6332  –onto→wfo 6334  ‘cfv 6336  (class class class)co 7151   ∈ cmpo 7153  1oc1o 8106  2oc2o 8107  ℝcr 10567  0cc0 10568  1c1 10569   + caddc 10571   < clt 10706   ≤ cle 10707   − cmin 10901  2c2 11722  ℕ0cn0 11927  ℝ+crp 12423  ...cfz 12932  ..^cfzo 13075  ♯chash 13733  Word cword 13906   ++ cconcat 13962  ⟨“cs1 13989   splice csplice 14151  ⟨“cs2 14243   ~FG cefg 18892 This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1798  ax-4 1812  ax-5 1912  ax-6 1971  ax-7 2016  ax-8 2114  ax-9 2122  ax-10 2143  ax-11 2159  ax-12 2176  ax-ext 2730  ax-rep 5157  ax-sep 5170  ax-nul 5177  ax-pow 5235  ax-pr 5299  ax-un 7460  ax-cnex 10624  ax-resscn 10625  ax-1cn 10626  ax-icn 10627  ax-addcl 10628  ax-addrcl 10629  ax-mulcl 10630  ax-mulrcl 10631  ax-mulcom 10632  ax-addass 10633  ax-mulass 10634  ax-distr 10635  ax-i2m1 10636  ax-1ne0 10637  ax-1rid 10638  ax-rnegex 10639  ax-rrecex 10640  ax-cnre 10641  ax-pre-lttri 10642  ax-pre-lttrn 10643  ax-pre-ltadd 10644  ax-pre-mulgt0 10645 This theorem depends on definitions:  df-bi 210  df-an 401  df-or 846  df-3or 1086  df-3an 1087  df-tru 1542  df-fal 1552  df-ex 1783  df-nf 1787  df-sb 2071  df-mo 2558  df-eu 2589  df-clab 2737  df-cleq 2751  df-clel 2831  df-nfc 2902  df-ne 2953  df-nel 3057  df-ral 3076  df-rex 3077  df-reu 3078  df-rab 3080  df-v 3412  df-sbc 3698  df-csb 3807  df-dif 3862  df-un 3864  df-in 3866  df-ss 3876  df-pss 3878  df-nul 4227  df-if 4422  df-pw 4497  df-sn 4524  df-pr 4526  df-tp 4528  df-op 4530  df-ot 4532  df-uni 4800  df-int 4840  df-iun 4886  df-br 5034  df-opab 5096  df-mpt 5114  df-tr 5140  df-id 5431  df-eprel 5436  df-po 5444  df-so 5445  df-fr 5484  df-we 5486  df-xp 5531  df-rel 5532  df-cnv 5533  df-co 5534  df-dm 5535  df-rn 5536  df-res 5537  df-ima 5538  df-pred 6127  df-ord 6173  df-on 6174  df-lim 6175  df-suc 6176  df-iota 6295  df-fun 6338  df-fn 6339  df-f 6340  df-f1 6341  df-fo 6342  df-f1o 6343  df-fv 6344  df-riota 7109  df-ov 7154  df-oprab 7155  df-mpo 7156  df-om 7581  df-1st 7694  df-2nd 7695  df-wrecs 7958  df-recs 8019  df-rdg 8057  df-1o 8113  df-2o 8114  df-oadd 8117  df-er 8300  df-map 8419  df-en 8529  df-dom 8530  df-sdom 8531  df-fin 8532  df-card 9394  df-pnf 10708  df-mnf 10709  df-xr 10710  df-ltxr 10711  df-le 10712  df-sub 10903  df-neg 10904  df-nn 11668  df-2 11730  df-n0 11928  df-xnn0 12000  df-z 12014  df-uz 12276  df-rp 12424  df-fz 12933  df-fzo 13076  df-hash 13734  df-word 13907  df-concat 13963  df-s1 13990  df-substr 14043  df-pfx 14073  df-splice 14152  df-s2 14250 This theorem is referenced by:  efgredlemc  18931  efgrelexlemb  18936  efgredeu  18938  efgred2  18939
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