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| Mirrors > Home > ILE Home > Th. List > 5p2e7 | GIF version | ||
| Description: 5 + 2 = 7. (Contributed by NM, 11-May-2004.) |
| Ref | Expression |
|---|---|
| 5p2e7 | ⊢ (5 + 2) = 7 |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | df-2 9295 | . . . . 5 ⊢ 2 = (1 + 1) | |
| 2 | 1 | oveq2i 6060 | . . . 4 ⊢ (5 + 2) = (5 + (1 + 1)) |
| 3 | 5cn 9316 | . . . . 5 ⊢ 5 ∈ ℂ | |
| 4 | ax-1cn 8219 | . . . . 5 ⊢ 1 ∈ ℂ | |
| 5 | 3, 4, 4 | addassi 8281 | . . . 4 ⊢ ((5 + 1) + 1) = (5 + (1 + 1)) |
| 6 | 2, 5 | eqtr4i 2256 | . . 3 ⊢ (5 + 2) = ((5 + 1) + 1) |
| 7 | df-6 9299 | . . . 4 ⊢ 6 = (5 + 1) | |
| 8 | 7 | oveq1i 6059 | . . 3 ⊢ (6 + 1) = ((5 + 1) + 1) |
| 9 | 6, 8 | eqtr4i 2256 | . 2 ⊢ (5 + 2) = (6 + 1) |
| 10 | df-7 9300 | . 2 ⊢ 7 = (6 + 1) | |
| 11 | 9, 10 | eqtr4i 2256 | 1 ⊢ (5 + 2) = 7 |
| Colors of variables: wff set class |
| Syntax hints: = wceq 1398 (class class class)co 6049 1c1 8127 + caddc 8129 2c2 9287 5c5 9290 6c6 9291 7c7 9292 |
| 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 717 ax-5 1496 ax-7 1497 ax-gen 1498 ax-ie1 1542 ax-ie2 1543 ax-8 1553 ax-10 1554 ax-11 1555 ax-i12 1556 ax-bndl 1558 ax-4 1559 ax-17 1575 ax-i9 1579 ax-ial 1583 ax-i5r 1584 ax-ext 2214 ax-resscn 8218 ax-1cn 8219 ax-1re 8220 ax-addrcl 8223 ax-addass 8228 |
| This theorem depends on definitions: df-bi 117 df-3an 1007 df-tru 1401 df-nf 1510 df-sb 1812 df-clab 2219 df-cleq 2225 df-clel 2228 df-nfc 2373 df-rex 2526 df-v 2814 df-un 3214 df-in 3216 df-ss 3223 df-sn 3694 df-pr 3695 df-op 3697 df-uni 3914 df-br 4109 df-iota 5311 df-fv 5359 df-ov 6052 df-2 9295 df-3 9296 df-4 9297 df-5 9298 df-6 9299 df-7 9300 |
| This theorem is referenced by: 5p3e8 9384 |
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