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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 9049 | . . . . 5 ⊢ 2 = (1 + 1) | |
| 2 | 1 | oveq2i 5933 | . . . 4 ⊢ (5 + 2) = (5 + (1 + 1)) |
| 3 | 5cn 9070 | . . . . 5 ⊢ 5 ∈ ℂ | |
| 4 | ax-1cn 7972 | . . . . 5 ⊢ 1 ∈ ℂ | |
| 5 | 3, 4, 4 | addassi 8034 | . . . 4 ⊢ ((5 + 1) + 1) = (5 + (1 + 1)) |
| 6 | 2, 5 | eqtr4i 2220 | . . 3 ⊢ (5 + 2) = ((5 + 1) + 1) |
| 7 | df-6 9053 | . . . 4 ⊢ 6 = (5 + 1) | |
| 8 | 7 | oveq1i 5932 | . . 3 ⊢ (6 + 1) = ((5 + 1) + 1) |
| 9 | 6, 8 | eqtr4i 2220 | . 2 ⊢ (5 + 2) = (6 + 1) |
| 10 | df-7 9054 | . 2 ⊢ 7 = (6 + 1) | |
| 11 | 9, 10 | eqtr4i 2220 | 1 ⊢ (5 + 2) = 7 |
| Colors of variables: wff set class |
| Syntax hints: = wceq 1364 (class class class)co 5922 1c1 7880 + caddc 7882 2c2 9041 5c5 9044 6c6 9045 7c7 9046 |
| 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 710 ax-5 1461 ax-7 1462 ax-gen 1463 ax-ie1 1507 ax-ie2 1508 ax-8 1518 ax-10 1519 ax-11 1520 ax-i12 1521 ax-bndl 1523 ax-4 1524 ax-17 1540 ax-i9 1544 ax-ial 1548 ax-i5r 1549 ax-ext 2178 ax-resscn 7971 ax-1cn 7972 ax-1re 7973 ax-addrcl 7976 ax-addass 7981 |
| This theorem depends on definitions: df-bi 117 df-3an 982 df-tru 1367 df-nf 1475 df-sb 1777 df-clab 2183 df-cleq 2189 df-clel 2192 df-nfc 2328 df-rex 2481 df-v 2765 df-un 3161 df-in 3163 df-ss 3170 df-sn 3628 df-pr 3629 df-op 3631 df-uni 3840 df-br 4034 df-iota 5219 df-fv 5266 df-ov 5925 df-2 9049 df-3 9050 df-4 9051 df-5 9052 df-6 9053 df-7 9054 |
| This theorem is referenced by: 5p3e8 9138 |
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