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| Mirrors > Home > MPE Home > Th. List > hasheqf1od | Structured version Visualization version GIF version | ||
| Description: The size of two sets is equal if there is a bijection mapping one of the sets onto the other. (Contributed by AV, 4-May-2021.) |
| Ref | Expression |
|---|---|
| hasheqf1od.a | ⊢ (𝜑 → 𝐴 ∈ 𝑈) |
| hasheqf1od.f | ⊢ (𝜑 → 𝐹:𝐴–1-1-onto→𝐵) |
| Ref | Expression |
|---|---|
| hasheqf1od | ⊢ (𝜑 → (♯‘𝐴) = (♯‘𝐵)) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | hasheqf1od.a | . 2 ⊢ (𝜑 → 𝐴 ∈ 𝑈) | |
| 2 | hasheqf1od.f | . . . . 5 ⊢ (𝜑 → 𝐹:𝐴–1-1-onto→𝐵) | |
| 3 | f1of 6828 | . . . . 5 ⊢ (𝐹:𝐴–1-1-onto→𝐵 → 𝐹:𝐴⟶𝐵) | |
| 4 | 2, 3 | syl 17 | . . . 4 ⊢ (𝜑 → 𝐹:𝐴⟶𝐵) |
| 5 | 4, 1 | fexd 7229 | . . 3 ⊢ (𝜑 → 𝐹 ∈ V) |
| 6 | f1oeq1 6816 | . . 3 ⊢ (𝑓 = 𝐹 → (𝑓:𝐴–1-1-onto→𝐵 ↔ 𝐹:𝐴–1-1-onto→𝐵)) | |
| 7 | 5, 2, 6 | spcedv 3581 | . 2 ⊢ (𝜑 → ∃𝑓 𝑓:𝐴–1-1-onto→𝐵) |
| 8 | hasheqf1oi 14373 | . 2 ⊢ (𝐴 ∈ 𝑈 → (∃𝑓 𝑓:𝐴–1-1-onto→𝐵 → (♯‘𝐴) = (♯‘𝐵))) | |
| 9 | 1, 7, 8 | sylc 65 | 1 ⊢ (𝜑 → (♯‘𝐴) = (♯‘𝐵)) |
| Colors of variables: wff setvar class |
| Syntax hints: → wi 4 = wceq 1539 ∃wex 1778 ∈ wcel 2107 Vcvv 3463 ⟶wf 6537 –1-1-onto→wf1o 6540 ‘cfv 6541 ♯chash 14352 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1794 ax-4 1808 ax-5 1909 ax-6 1966 ax-7 2006 ax-8 2109 ax-9 2117 ax-10 2140 ax-11 2156 ax-12 2176 ax-ext 2706 ax-rep 5259 ax-sep 5276 ax-nul 5286 ax-pow 5345 ax-pr 5412 ax-un 7737 ax-cnex 11193 ax-resscn 11194 ax-1cn 11195 ax-icn 11196 ax-addcl 11197 ax-addrcl 11198 ax-mulcl 11199 ax-mulrcl 11200 ax-mulcom 11201 ax-addass 11202 ax-mulass 11203 ax-distr 11204 ax-i2m1 11205 ax-1ne0 11206 ax-1rid 11207 ax-rnegex 11208 ax-rrecex 11209 ax-cnre 11210 ax-pre-lttri 11211 ax-pre-lttrn 11212 ax-pre-ltadd 11213 ax-pre-mulgt0 11214 |
| This theorem depends on definitions: df-bi 207 df-an 396 df-or 848 df-3or 1087 df-3an 1088 df-tru 1542 df-fal 1552 df-ex 1779 df-nf 1783 df-sb 2064 df-mo 2538 df-eu 2567 df-clab 2713 df-cleq 2726 df-clel 2808 df-nfc 2884 df-ne 2932 df-nel 3036 df-ral 3051 df-rex 3060 df-reu 3364 df-rab 3420 df-v 3465 df-sbc 3771 df-csb 3880 df-dif 3934 df-un 3936 df-in 3938 df-ss 3948 df-pss 3951 df-nul 4314 df-if 4506 df-pw 4582 df-sn 4607 df-pr 4609 df-op 4613 df-uni 4888 df-int 4927 df-iun 4973 df-br 5124 df-opab 5186 df-mpt 5206 df-tr 5240 df-id 5558 df-eprel 5564 df-po 5572 df-so 5573 df-fr 5617 df-we 5619 df-xp 5671 df-rel 5672 df-cnv 5673 df-co 5674 df-dm 5675 df-rn 5676 df-res 5677 df-ima 5678 df-pred 6301 df-ord 6366 df-on 6367 df-lim 6368 df-suc 6369 df-iota 6494 df-fun 6543 df-fn 6544 df-f 6545 df-f1 6546 df-fo 6547 df-f1o 6548 df-fv 6549 df-riota 7370 df-ov 7416 df-oprab 7417 df-mpo 7418 df-om 7870 df-2nd 7997 df-frecs 8288 df-wrecs 8319 df-recs 8393 df-rdg 8432 df-1o 8488 df-er 8727 df-en 8968 df-dom 8969 df-sdom 8970 df-fin 8971 df-card 9961 df-pnf 11279 df-mnf 11280 df-xr 11281 df-ltxr 11282 df-le 11283 df-sub 11476 df-neg 11477 df-nn 12249 df-n0 12510 df-z 12597 df-uz 12861 df-hash 14353 |
| This theorem is referenced by: summolem2a 15734 prodmolem2a 15953 4sqlem11 16976 orbsta2 19302 sylow2a 19606 lsmhash 19692 gsumval3lem1 19892 gsumval3lem2 19893 gsumval3 19894 basellem5 27065 0sgmppw 27179 logfac2 27198 usgredgleordALT 29180 vtxdushgrfvedglem 29436 vtxdushgrfvedg 29437 clwlkssizeeq 30033 frgrncvvdeq 30257 numclwwlk2lem3 30328 subfacp1lem3 35162 subfacp1lem5 35164 sticksstones14 42136 grtriprop 47881 |
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