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| Mirrors > Home > ILE Home > Th. List > 6p2e8 | GIF version | ||
| Description: 6 + 2 = 8. (Contributed by NM, 11-May-2004.) |
| Ref | Expression |
|---|---|
| 6p2e8 | ⊢ (6 + 2) = 8 |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | df-2 9372 | . . . . 5 ⊢ 2 = (1 + 1) | |
| 2 | 1 | oveq2i 6099 | . . . 4 ⊢ (6 + 2) = (6 + (1 + 1)) |
| 3 | 6cn 9395 | . . . . 5 ⊢ 6 ∈ ℂ | |
| 4 | ax-1cn 8278 | . . . . 5 ⊢ 1 ∈ ℂ | |
| 5 | 3, 4, 4 | addassi 8340 | . . . 4 ⊢ ((6 + 1) + 1) = (6 + (1 + 1)) |
| 6 | 2, 5 | eqtr4i 2262 | . . 3 ⊢ (6 + 2) = ((6 + 1) + 1) |
| 7 | df-7 9377 | . . . 4 ⊢ 7 = (6 + 1) | |
| 8 | 7 | oveq1i 6098 | . . 3 ⊢ (7 + 1) = ((6 + 1) + 1) |
| 9 | 6, 8 | eqtr4i 2262 | . 2 ⊢ (6 + 2) = (7 + 1) |
| 10 | df-8 9378 | . 2 ⊢ 8 = (7 + 1) | |
| 11 | 9, 10 | eqtr4i 2262 | 1 ⊢ (6 + 2) = 8 |
| Colors of variables: wff set class |
| This proof depends on syntax axioms: = wceq 1402 (class class class)co 6088 1c1 8186 + caddc 8188 2c2 9364 6c6 9368 7c7 9369 8c8 9370 |
| This proof depends on 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-ext 2220 ax-resscn 8277 ax-1cn 8278 ax-1re 8279 ax-addrcl 8282 ax-addass 8287 |
| This proof depends on definitions: df-bi 117 df-3an 1011 df-tru 1405 df-nf 1514 df-sb 1816 df-clab 2225 df-cleq 2231 df-clel 2234 df-nfc 2381 df-rex 2534 df-v 2823 df-un 3224 df-in 3226 df-ss 3233 df-sn 3715 df-pr 3716 df-op 3718 df-uni 3936 df-br 4132 df-iota 5340 df-fv 5388 df-ov 6091 df-2 9372 df-3 9373 df-4 9374 df-5 9375 df-6 9376 df-7 9377 df-8 9378 |
| This theorem is used by: 6p3e9 9464 6t3e18 9897 83prm 13266 1259lem2 13272 1259lem5 13275 log2ublog2 16224 |
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