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 12259 | . . . . . . 7 ⊢ 0 ∈ ℕ0 | |
2 | 1 | a1i 11 | . . . . . 6 ⊢ (𝜑 → 0 ∈ ℕ0) |
3 | s2f1.i | . . . . . 6 ⊢ (𝜑 → 𝐼 ∈ 𝐷) | |
4 | 1nn0 12260 | . . . . . . 7 ⊢ 1 ∈ ℕ0 | |
5 | 4 | a1i 11 | . . . . . 6 ⊢ (𝜑 → 1 ∈ ℕ0) |
6 | s2f1.j | . . . . . 6 ⊢ (𝜑 → 𝐽 ∈ 𝐷) | |
7 | 0ne1 12055 | . . . . . . 7 ⊢ 0 ≠ 1 | |
8 | 7 | a1i 11 | . . . . . 6 ⊢ (𝜑 → 0 ≠ 1) |
9 | s2f1.1 | . . . . . 6 ⊢ (𝜑 → 𝐼 ≠ 𝐽) | |
10 | f1oprg 6758 | . . . . . . 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 14631 | . . . . . . 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 6709 | . . . . 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 6713 | . . . 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 4761 | . . 3 ⊢ (𝜑 → {𝐼, 𝐽} ⊆ 𝐷) |
20 | f1ss 6674 | . . 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 6672 | . . . 4 ⊢ (〈“𝐼𝐽”〉:{0, 1}–1-1→𝐷 → dom 〈“𝐼𝐽”〉 = {0, 1}) | |
23 | 21, 22 | syl 17 | . . 3 ⊢ (𝜑 → dom 〈“𝐼𝐽”〉 = {0, 1}) |
24 | f1eq2 6664 | . . 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 1542 ∈ wcel 2110 ≠ wne 2945 ⊆ wss 3892 {cpr 4569 〈cop 4573 dom cdm 5590 –1-1→wf1 6429 –1-1-onto→wf1o 6431 0cc0 10882 1c1 10883 ℕ0cn0 12244 〈“cs2 14565 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1802 ax-4 1816 ax-5 1917 ax-6 1975 ax-7 2015 ax-8 2112 ax-9 2120 ax-10 2141 ax-11 2158 ax-12 2175 ax-ext 2711 ax-rep 5214 ax-sep 5227 ax-nul 5234 ax-pow 5292 ax-pr 5356 ax-un 7583 ax-cnex 10938 ax-resscn 10939 ax-1cn 10940 ax-icn 10941 ax-addcl 10942 ax-addrcl 10943 ax-mulcl 10944 ax-mulrcl 10945 ax-mulcom 10946 ax-addass 10947 ax-mulass 10948 ax-distr 10949 ax-i2m1 10950 ax-1ne0 10951 ax-1rid 10952 ax-rnegex 10953 ax-rrecex 10954 ax-cnre 10955 ax-pre-lttri 10956 ax-pre-lttrn 10957 ax-pre-ltadd 10958 ax-pre-mulgt0 10959 |
This theorem depends on definitions: df-bi 206 df-an 397 df-or 845 df-3or 1087 df-3an 1088 df-tru 1545 df-fal 1555 df-ex 1787 df-nf 1791 df-sb 2072 df-mo 2542 df-eu 2571 df-clab 2718 df-cleq 2732 df-clel 2818 df-nfc 2891 df-ne 2946 df-nel 3052 df-ral 3071 df-rex 3072 df-reu 3073 df-rab 3075 df-v 3433 df-sbc 3721 df-csb 3838 df-dif 3895 df-un 3897 df-in 3899 df-ss 3909 df-pss 3911 df-nul 4263 df-if 4466 df-pw 4541 df-sn 4568 df-pr 4570 df-op 4574 df-uni 4846 df-int 4886 df-iun 4932 df-br 5080 df-opab 5142 df-mpt 5163 df-tr 5197 df-id 5490 df-eprel 5496 df-po 5504 df-so 5505 df-fr 5545 df-we 5547 df-xp 5596 df-rel 5597 df-cnv 5598 df-co 5599 df-dm 5600 df-rn 5601 df-res 5602 df-ima 5603 df-pred 6201 df-ord 6268 df-on 6269 df-lim 6270 df-suc 6271 df-iota 6390 df-fun 6434 df-fn 6435 df-f 6436 df-f1 6437 df-fo 6438 df-f1o 6439 df-fv 6440 df-riota 7229 df-ov 7275 df-oprab 7276 df-mpo 7277 df-om 7708 df-1st 7825 df-2nd 7826 df-frecs 8089 df-wrecs 8120 df-recs 8194 df-rdg 8233 df-1o 8289 df-er 8490 df-en 8726 df-dom 8727 df-sdom 8728 df-fin 8729 df-card 9708 df-pnf 11022 df-mnf 11023 df-xr 11024 df-ltxr 11025 df-le 11026 df-sub 11218 df-neg 11219 df-nn 11985 df-n0 12245 df-z 12331 df-uz 12594 df-fz 13251 df-fzo 13394 df-hash 14056 df-word 14229 df-concat 14285 df-s1 14312 df-s2 14572 |
This theorem is referenced by: cycpm2tr 31395 cycpm2cl 31396 cyc2fv1 31397 cyc2fv2 31398 cycpmco2 31409 cyc2fvx 31410 cyc3co2 31416 cyc3conja 31433 |
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