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| Mirrors > Home > ILE Home > Th. List > eqfnfvd | GIF version | ||
| Description: Deduction for equality of functions. (Contributed by Mario Carneiro, 24-Jul-2014.) |
| Ref | Expression |
|---|---|
| eqfnfvd.1 | ⊢ (𝜑 → 𝐹 Fn 𝐴) |
| eqfnfvd.2 | ⊢ (𝜑 → 𝐺 Fn 𝐴) |
| eqfnfvd.3 | ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐴) → (𝐹‘𝑥) = (𝐺‘𝑥)) |
| Ref | Expression |
|---|---|
| eqfnfvd | ⊢ (𝜑 → 𝐹 = 𝐺) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | eqfnfvd.3 | . . 3 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐴) → (𝐹‘𝑥) = (𝐺‘𝑥)) | |
| 2 | 1 | ralrimiva 2623 | . 2 ⊢ (𝜑 → ∀𝑥 ∈ 𝐴 (𝐹‘𝑥) = (𝐺‘𝑥)) |
| 3 | eqfnfvd.1 | . . 3 ⊢ (𝜑 → 𝐹 Fn 𝐴) | |
| 4 | eqfnfvd.2 | . . 3 ⊢ (𝜑 → 𝐺 Fn 𝐴) | |
| 5 | eqfnfv 5797 | . . 3 ⊢ ((𝐹 Fn 𝐴 ∧ 𝐺 Fn 𝐴) → (𝐹 = 𝐺 ↔ ∀𝑥 ∈ 𝐴 (𝐹‘𝑥) = (𝐺‘𝑥))) | |
| 6 | 3, 4, 5 | syl2anc 415 | . 2 ⊢ (𝜑 → (𝐹 = 𝐺 ↔ ∀𝑥 ∈ 𝐴 (𝐹‘𝑥) = (𝐺‘𝑥))) |
| 7 | 2, 6 | mpbird 167 | 1 ⊢ (𝜑 → 𝐹 = 𝐺) |
| Colors of variables: wff set class |
| Syntax hints: → wi 4 ∧ wa 104 ↔ wb 105 = wceq 1402 ∈ wcel 2209 ∀wral 2528 Fn wfn 5367 ‘cfv 5372 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 106 ax-ia2 107 ax-ia3 108 ax-io 721 ax-5 1500 ax-7 1501 ax-gen 1502 ax-ie1 1546 ax-ie2 1547 ax-8 1557 ax-10 1558 ax-11 1559 ax-i12 1560 ax-bndl 1562 ax-4 1563 ax-17 1579 ax-i9 1583 ax-ial 1587 ax-i5r 1588 ax-14 2212 ax-ext 2220 ax-sep 4244 ax-pow 4306 ax-pr 4341 |
| This theorem depends on definitions: df-bi 117 df-3an 1011 df-tru 1405 df-nf 1514 df-sb 1816 df-eu 2089 df-mo 2090 df-clab 2225 df-cleq 2231 df-clel 2234 df-nfc 2381 df-ral 2533 df-rex 2534 df-v 2823 df-sbc 3052 df-csb 3148 df-un 3224 df-in 3226 df-ss 3233 df-pw 3687 df-sn 3711 df-pr 3712 df-op 3714 df-uni 3931 df-br 4126 df-opab 4188 df-mpt 4189 df-id 4433 df-xp 4775 df-rel 4776 df-cnv 4777 df-co 4778 df-dm 4779 df-iota 5332 df-fun 5374 df-fn 5375 df-fv 5380 |
| This theorem is referenced by: foeqcnvco 5986 f1eqcocnv 5987 offeq 6306 tfrlem1 6569 frecrdg 6669 updjudhcoinlf 7410 updjudhcoinrg 7411 nnnninfeq 7458 seq3val 10875 seqvalcd 10876 seq3feq2 10891 seq3feq 10895 seqfeq3 10944 ccatlid 11352 ccatrid 11353 ccatass 11354 ccatswrd 11420 swrdccat2 11421 pfxid 11436 ccatpfx 11451 pfxccat1 11452 swrdswrd 11455 cats1un 11471 swrdccatin1 11475 swrdccatin2 11479 pfxccatin12 11483 seq3shft 11581 efcvgfsum 12412 nninfctlemfo 12795 xpsfeq 13643 gsumf1ofi 14137 upxp 15296 uptx 15298 dvidlemap 15715 dvidrelem 15716 dvidsslem 15717 dvrecap 15737 depindlem3 16663 peano4nninf 16954 nninfsellemeqinf 16964 nninffeq 16968 refeq 16978 |
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