Mathbox for Thierry Arnoux |
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Mirrors > Home > MPE Home > Th. List > Mathboxes > s2f1 | Structured version Visualization version GIF version |
Description: Conditions for a length 2 string to be a one-to-one function. (Contributed by Thierry Arnoux, 19-Sep-2023.) |
Ref | Expression |
---|---|
s2f1.i | ⊢ (𝜑 → 𝐼 ∈ 𝐷) |
s2f1.j | ⊢ (𝜑 → 𝐽 ∈ 𝐷) |
s2f1.1 | ⊢ (𝜑 → 𝐼 ≠ 𝐽) |
Ref | Expression |
---|---|
s2f1 | ⊢ (𝜑 → 〈“𝐼𝐽”〉:dom 〈“𝐼𝐽”〉–1-1→𝐷) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | 0nn0 12248 | . . . . . . 7 ⊢ 0 ∈ ℕ0 | |
2 | 1 | a1i 11 | . . . . . 6 ⊢ (𝜑 → 0 ∈ ℕ0) |
3 | s2f1.i | . . . . . 6 ⊢ (𝜑 → 𝐼 ∈ 𝐷) | |
4 | 1nn0 12249 | . . . . . . 7 ⊢ 1 ∈ ℕ0 | |
5 | 4 | a1i 11 | . . . . . 6 ⊢ (𝜑 → 1 ∈ ℕ0) |
6 | s2f1.j | . . . . . 6 ⊢ (𝜑 → 𝐽 ∈ 𝐷) | |
7 | 0ne1 12044 | . . . . . . 7 ⊢ 0 ≠ 1 | |
8 | 7 | a1i 11 | . . . . . 6 ⊢ (𝜑 → 0 ≠ 1) |
9 | s2f1.1 | . . . . . 6 ⊢ (𝜑 → 𝐼 ≠ 𝐽) | |
10 | f1oprg 6761 | . . . . . . 7 ⊢ (((0 ∈ ℕ0 ∧ 𝐼 ∈ 𝐷) ∧ (1 ∈ ℕ0 ∧ 𝐽 ∈ 𝐷)) → ((0 ≠ 1 ∧ 𝐼 ≠ 𝐽) → {〈0, 𝐼〉, 〈1, 𝐽〉}:{0, 1}–1-1-onto→{𝐼, 𝐽})) | |
11 | 10 | 3impia 1116 | . . . . . 6 ⊢ (((0 ∈ ℕ0 ∧ 𝐼 ∈ 𝐷) ∧ (1 ∈ ℕ0 ∧ 𝐽 ∈ 𝐷) ∧ (0 ≠ 1 ∧ 𝐼 ≠ 𝐽)) → {〈0, 𝐼〉, 〈1, 𝐽〉}:{0, 1}–1-1-onto→{𝐼, 𝐽}) |
12 | 2, 3, 5, 6, 8, 9, 11 | syl222anc 1385 | . . . . 5 ⊢ (𝜑 → {〈0, 𝐼〉, 〈1, 𝐽〉}:{0, 1}–1-1-onto→{𝐼, 𝐽}) |
13 | s2prop 14620 | . . . . . . 7 ⊢ ((𝐼 ∈ 𝐷 ∧ 𝐽 ∈ 𝐷) → 〈“𝐼𝐽”〉 = {〈0, 𝐼〉, 〈1, 𝐽〉}) | |
14 | 3, 6, 13 | syl2anc 584 | . . . . . 6 ⊢ (𝜑 → 〈“𝐼𝐽”〉 = {〈0, 𝐼〉, 〈1, 𝐽〉}) |
15 | 14 | f1oeq1d 6711 | . . . . 5 ⊢ (𝜑 → (〈“𝐼𝐽”〉:{0, 1}–1-1-onto→{𝐼, 𝐽} ↔ {〈0, 𝐼〉, 〈1, 𝐽〉}:{0, 1}–1-1-onto→{𝐼, 𝐽})) |
16 | 12, 15 | mpbird 256 | . . . 4 ⊢ (𝜑 → 〈“𝐼𝐽”〉:{0, 1}–1-1-onto→{𝐼, 𝐽}) |
17 | f1of1 6715 | . . . 4 ⊢ (〈“𝐼𝐽”〉:{0, 1}–1-1-onto→{𝐼, 𝐽} → 〈“𝐼𝐽”〉:{0, 1}–1-1→{𝐼, 𝐽}) | |
18 | 16, 17 | syl 17 | . . 3 ⊢ (𝜑 → 〈“𝐼𝐽”〉:{0, 1}–1-1→{𝐼, 𝐽}) |
19 | 3, 6 | prssd 4755 | . . 3 ⊢ (𝜑 → {𝐼, 𝐽} ⊆ 𝐷) |
20 | f1ss 6676 | . . 3 ⊢ ((〈“𝐼𝐽”〉:{0, 1}–1-1→{𝐼, 𝐽} ∧ {𝐼, 𝐽} ⊆ 𝐷) → 〈“𝐼𝐽”〉:{0, 1}–1-1→𝐷) | |
21 | 18, 19, 20 | syl2anc 584 | . 2 ⊢ (𝜑 → 〈“𝐼𝐽”〉:{0, 1}–1-1→𝐷) |
22 | f1dm 6674 | . . . 4 ⊢ (〈“𝐼𝐽”〉:{0, 1}–1-1→𝐷 → dom 〈“𝐼𝐽”〉 = {0, 1}) | |
23 | 21, 22 | syl 17 | . . 3 ⊢ (𝜑 → dom 〈“𝐼𝐽”〉 = {0, 1}) |
24 | f1eq2 6666 | . . 3 ⊢ (dom 〈“𝐼𝐽”〉 = {0, 1} → (〈“𝐼𝐽”〉:dom 〈“𝐼𝐽”〉–1-1→𝐷 ↔ 〈“𝐼𝐽”〉:{0, 1}–1-1→𝐷)) | |
25 | 23, 24 | syl 17 | . 2 ⊢ (𝜑 → (〈“𝐼𝐽”〉:dom 〈“𝐼𝐽”〉–1-1→𝐷 ↔ 〈“𝐼𝐽”〉:{0, 1}–1-1→𝐷)) |
26 | 21, 25 | mpbird 256 | 1 ⊢ (𝜑 → 〈“𝐼𝐽”〉:dom 〈“𝐼𝐽”〉–1-1→𝐷) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ↔ wb 205 ∧ wa 396 = wceq 1539 ∈ wcel 2106 ≠ wne 2943 ⊆ wss 3887 {cpr 4563 〈cop 4567 dom cdm 5589 –1-1→wf1 6430 –1-1-onto→wf1o 6432 0cc0 10871 1c1 10872 ℕ0cn0 12233 〈“cs2 14554 |
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 1913 ax-6 1971 ax-7 2011 ax-8 2108 ax-9 2116 ax-10 2137 ax-11 2154 ax-12 2171 ax-ext 2709 ax-rep 5209 ax-sep 5223 ax-nul 5230 ax-pow 5288 ax-pr 5352 ax-un 7588 ax-cnex 10927 ax-resscn 10928 ax-1cn 10929 ax-icn 10930 ax-addcl 10931 ax-addrcl 10932 ax-mulcl 10933 ax-mulrcl 10934 ax-mulcom 10935 ax-addass 10936 ax-mulass 10937 ax-distr 10938 ax-i2m1 10939 ax-1ne0 10940 ax-1rid 10941 ax-rnegex 10942 ax-rrecex 10943 ax-cnre 10944 ax-pre-lttri 10945 ax-pre-lttrn 10946 ax-pre-ltadd 10947 ax-pre-mulgt0 10948 |
This theorem depends on definitions: df-bi 206 df-an 397 df-or 845 df-3or 1087 df-3an 1088 df-tru 1542 df-fal 1552 df-ex 1783 df-nf 1787 df-sb 2068 df-mo 2540 df-eu 2569 df-clab 2716 df-cleq 2730 df-clel 2816 df-nfc 2889 df-ne 2944 df-nel 3050 df-ral 3069 df-rex 3070 df-reu 3072 df-rab 3073 df-v 3434 df-sbc 3717 df-csb 3833 df-dif 3890 df-un 3892 df-in 3894 df-ss 3904 df-pss 3906 df-nul 4257 df-if 4460 df-pw 4535 df-sn 4562 df-pr 4564 df-op 4568 df-uni 4840 df-int 4880 df-iun 4926 df-br 5075 df-opab 5137 df-mpt 5158 df-tr 5192 df-id 5489 df-eprel 5495 df-po 5503 df-so 5504 df-fr 5544 df-we 5546 df-xp 5595 df-rel 5596 df-cnv 5597 df-co 5598 df-dm 5599 df-rn 5600 df-res 5601 df-ima 5602 df-pred 6202 df-ord 6269 df-on 6270 df-lim 6271 df-suc 6272 df-iota 6391 df-fun 6435 df-fn 6436 df-f 6437 df-f1 6438 df-fo 6439 df-f1o 6440 df-fv 6441 df-riota 7232 df-ov 7278 df-oprab 7279 df-mpo 7280 df-om 7713 df-1st 7831 df-2nd 7832 df-frecs 8097 df-wrecs 8128 df-recs 8202 df-rdg 8241 df-1o 8297 df-er 8498 df-en 8734 df-dom 8735 df-sdom 8736 df-fin 8737 df-card 9697 df-pnf 11011 df-mnf 11012 df-xr 11013 df-ltxr 11014 df-le 11015 df-sub 11207 df-neg 11208 df-nn 11974 df-n0 12234 df-z 12320 df-uz 12583 df-fz 13240 df-fzo 13383 df-hash 14045 df-word 14218 df-concat 14274 df-s1 14301 df-s2 14561 |
This theorem is referenced by: cycpm2tr 31386 cycpm2cl 31387 cyc2fv1 31388 cyc2fv2 31389 cycpmco2 31400 cyc2fvx 31401 cyc3co2 31407 cyc3conja 31424 |
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