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Mirrors > Home > ILE Home > Th. List > fveq12i | GIF version |
Description: Equality deduction for function value. (Contributed by FL, 27-Jun-2014.) |
Ref | Expression |
---|---|
fveq12i.1 | ⊢ 𝐹 = 𝐺 |
fveq12i.2 | ⊢ 𝐴 = 𝐵 |
Ref | Expression |
---|---|
fveq12i | ⊢ (𝐹‘𝐴) = (𝐺‘𝐵) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | fveq12i.1 | . . 3 ⊢ 𝐹 = 𝐺 | |
2 | 1 | fveq1i 5415 | . 2 ⊢ (𝐹‘𝐴) = (𝐺‘𝐴) |
3 | fveq12i.2 | . . 3 ⊢ 𝐴 = 𝐵 | |
4 | 3 | fveq2i 5417 | . 2 ⊢ (𝐺‘𝐴) = (𝐺‘𝐵) |
5 | 2, 4 | eqtri 2158 | 1 ⊢ (𝐹‘𝐴) = (𝐺‘𝐵) |
Colors of variables: wff set class |
Syntax hints: = wceq 1331 ‘cfv 5118 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 105 ax-ia2 106 ax-ia3 107 ax-io 698 ax-5 1423 ax-7 1424 ax-gen 1425 ax-ie1 1469 ax-ie2 1470 ax-8 1482 ax-10 1483 ax-11 1484 ax-i12 1485 ax-bndl 1486 ax-4 1487 ax-17 1506 ax-i9 1510 ax-ial 1514 ax-i5r 1515 ax-ext 2119 |
This theorem depends on definitions: df-bi 116 df-3an 964 df-tru 1334 df-nf 1437 df-sb 1736 df-clab 2124 df-cleq 2130 df-clel 2133 df-nfc 2268 df-rex 2420 df-v 2683 df-un 3070 df-sn 3528 df-pr 3529 df-op 3531 df-uni 3732 df-br 3925 df-iota 5083 df-fv 5126 |
This theorem is referenced by: (None) |
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