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| Description: Equality of two operations is determined by their values. (Contributed by NM, 1-Sep-2005.) | 
| Ref | Expression | 
|---|---|
| eqfnov | ⊢ ((𝐹 Fn (𝐴 × 𝐵) ∧ 𝐺 Fn (𝐶 × 𝐷)) → (𝐹 = 𝐺 ↔ ((𝐴 × 𝐵) = (𝐶 × 𝐷) ∧ ∀𝑥 ∈ 𝐴 ∀𝑦 ∈ 𝐵 (𝑥𝐹𝑦) = (𝑥𝐺𝑦)))) | 
| Step | Hyp | Ref | Expression | 
|---|---|---|---|
| 1 | eqfnfv2 7052 | . 2 ⊢ ((𝐹 Fn (𝐴 × 𝐵) ∧ 𝐺 Fn (𝐶 × 𝐷)) → (𝐹 = 𝐺 ↔ ((𝐴 × 𝐵) = (𝐶 × 𝐷) ∧ ∀𝑧 ∈ (𝐴 × 𝐵)(𝐹‘𝑧) = (𝐺‘𝑧)))) | |
| 2 | fveq2 6906 | . . . . . 6 ⊢ (𝑧 = 〈𝑥, 𝑦〉 → (𝐹‘𝑧) = (𝐹‘〈𝑥, 𝑦〉)) | |
| 3 | fveq2 6906 | . . . . . 6 ⊢ (𝑧 = 〈𝑥, 𝑦〉 → (𝐺‘𝑧) = (𝐺‘〈𝑥, 𝑦〉)) | |
| 4 | 2, 3 | eqeq12d 2753 | . . . . 5 ⊢ (𝑧 = 〈𝑥, 𝑦〉 → ((𝐹‘𝑧) = (𝐺‘𝑧) ↔ (𝐹‘〈𝑥, 𝑦〉) = (𝐺‘〈𝑥, 𝑦〉))) | 
| 5 | df-ov 7434 | . . . . . 6 ⊢ (𝑥𝐹𝑦) = (𝐹‘〈𝑥, 𝑦〉) | |
| 6 | df-ov 7434 | . . . . . 6 ⊢ (𝑥𝐺𝑦) = (𝐺‘〈𝑥, 𝑦〉) | |
| 7 | 5, 6 | eqeq12i 2755 | . . . . 5 ⊢ ((𝑥𝐹𝑦) = (𝑥𝐺𝑦) ↔ (𝐹‘〈𝑥, 𝑦〉) = (𝐺‘〈𝑥, 𝑦〉)) | 
| 8 | 4, 7 | bitr4di 289 | . . . 4 ⊢ (𝑧 = 〈𝑥, 𝑦〉 → ((𝐹‘𝑧) = (𝐺‘𝑧) ↔ (𝑥𝐹𝑦) = (𝑥𝐺𝑦))) | 
| 9 | 8 | ralxp 5852 | . . 3 ⊢ (∀𝑧 ∈ (𝐴 × 𝐵)(𝐹‘𝑧) = (𝐺‘𝑧) ↔ ∀𝑥 ∈ 𝐴 ∀𝑦 ∈ 𝐵 (𝑥𝐹𝑦) = (𝑥𝐺𝑦)) | 
| 10 | 9 | anbi2i 623 | . 2 ⊢ (((𝐴 × 𝐵) = (𝐶 × 𝐷) ∧ ∀𝑧 ∈ (𝐴 × 𝐵)(𝐹‘𝑧) = (𝐺‘𝑧)) ↔ ((𝐴 × 𝐵) = (𝐶 × 𝐷) ∧ ∀𝑥 ∈ 𝐴 ∀𝑦 ∈ 𝐵 (𝑥𝐹𝑦) = (𝑥𝐺𝑦))) | 
| 11 | 1, 10 | bitrdi 287 | 1 ⊢ ((𝐹 Fn (𝐴 × 𝐵) ∧ 𝐺 Fn (𝐶 × 𝐷)) → (𝐹 = 𝐺 ↔ ((𝐴 × 𝐵) = (𝐶 × 𝐷) ∧ ∀𝑥 ∈ 𝐴 ∀𝑦 ∈ 𝐵 (𝑥𝐹𝑦) = (𝑥𝐺𝑦)))) | 
| Colors of variables: wff setvar class | 
| Syntax hints: → wi 4 ↔ wb 206 ∧ wa 395 = wceq 1540 ∀wral 3061 〈cop 4632 × cxp 5683 Fn wfn 6556 ‘cfv 6561 (class class class)co 7431 | 
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1795 ax-4 1809 ax-5 1910 ax-6 1967 ax-7 2007 ax-8 2110 ax-9 2118 ax-10 2141 ax-11 2157 ax-12 2177 ax-ext 2708 ax-sep 5296 ax-nul 5306 ax-pr 5432 | 
| This theorem depends on definitions: df-bi 207 df-an 396 df-or 849 df-3an 1089 df-tru 1543 df-fal 1553 df-ex 1780 df-nf 1784 df-sb 2065 df-mo 2540 df-eu 2569 df-clab 2715 df-cleq 2729 df-clel 2816 df-nfc 2892 df-ne 2941 df-ral 3062 df-rex 3071 df-rab 3437 df-v 3482 df-sbc 3789 df-csb 3900 df-dif 3954 df-un 3956 df-in 3958 df-ss 3968 df-nul 4334 df-if 4526 df-sn 4627 df-pr 4629 df-op 4633 df-uni 4908 df-iun 4993 df-br 5144 df-opab 5206 df-mpt 5226 df-id 5578 df-xp 5691 df-rel 5692 df-cnv 5693 df-co 5694 df-dm 5695 df-rn 5696 df-res 5697 df-ima 5698 df-iota 6514 df-fun 6563 df-fn 6564 df-fv 6569 df-ov 7434 | 
| This theorem is referenced by: eqfnov2 7563 oprres 7601 ssceq 17870 sspg 30747 ssps 30749 sspmlem 30751 | 
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