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| Mirrors > Home > ILE Home > Th. List > 4p3e7 | GIF version | ||
| Description: 4 + 3 = 7. (Contributed by NM, 11-May-2004.) |
| Ref | Expression |
|---|---|
| 4p3e7 | ⊢ (4 + 3) = 7 |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | df-3 9193 | . . . 4 ⊢ 3 = (2 + 1) | |
| 2 | 1 | oveq2i 6024 | . . 3 ⊢ (4 + 3) = (4 + (2 + 1)) |
| 3 | 4cn 9211 | . . . 4 ⊢ 4 ∈ ℂ | |
| 4 | 2cn 9204 | . . . 4 ⊢ 2 ∈ ℂ | |
| 5 | ax-1cn 8115 | . . . 4 ⊢ 1 ∈ ℂ | |
| 6 | 3, 4, 5 | addassi 8177 | . . 3 ⊢ ((4 + 2) + 1) = (4 + (2 + 1)) |
| 7 | 2, 6 | eqtr4i 2253 | . 2 ⊢ (4 + 3) = ((4 + 2) + 1) |
| 8 | df-7 9197 | . . 3 ⊢ 7 = (6 + 1) | |
| 9 | 4p2e6 9277 | . . . 4 ⊢ (4 + 2) = 6 | |
| 10 | 9 | oveq1i 6023 | . . 3 ⊢ ((4 + 2) + 1) = (6 + 1) |
| 11 | 8, 10 | eqtr4i 2253 | . 2 ⊢ 7 = ((4 + 2) + 1) |
| 12 | 7, 11 | eqtr4i 2253 | 1 ⊢ (4 + 3) = 7 |
| Colors of variables: wff set class |
| Syntax hints: = wceq 1395 (class class class)co 6013 1c1 8023 + caddc 8025 2c2 9184 3c3 9185 4c4 9186 6c6 9188 7c7 9189 |
| 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 714 ax-5 1493 ax-7 1494 ax-gen 1495 ax-ie1 1539 ax-ie2 1540 ax-8 1550 ax-10 1551 ax-11 1552 ax-i12 1553 ax-bndl 1555 ax-4 1556 ax-17 1572 ax-i9 1576 ax-ial 1580 ax-i5r 1581 ax-ext 2211 ax-resscn 8114 ax-1cn 8115 ax-1re 8116 ax-addrcl 8119 ax-addass 8124 |
| This theorem depends on definitions: df-bi 117 df-3an 1004 df-tru 1398 df-nf 1507 df-sb 1809 df-clab 2216 df-cleq 2222 df-clel 2225 df-nfc 2361 df-rex 2514 df-v 2802 df-un 3202 df-in 3204 df-ss 3211 df-sn 3673 df-pr 3674 df-op 3676 df-uni 3892 df-br 4087 df-iota 5284 df-fv 5332 df-ov 6016 df-2 9192 df-3 9193 df-4 9194 df-5 9195 df-6 9196 df-7 9197 |
| This theorem is referenced by: 4p4e8 9279 2lgslem3d 15815 2lgsoddprmlem3d 15829 |
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