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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 9181 | . . . 4 ⊢ 3 = (2 + 1) | |
| 2 | 1 | oveq2i 6018 | . . 3 ⊢ (4 + 3) = (4 + (2 + 1)) |
| 3 | 4cn 9199 | . . . 4 ⊢ 4 ∈ ℂ | |
| 4 | 2cn 9192 | . . . 4 ⊢ 2 ∈ ℂ | |
| 5 | ax-1cn 8103 | . . . 4 ⊢ 1 ∈ ℂ | |
| 6 | 3, 4, 5 | addassi 8165 | . . 3 ⊢ ((4 + 2) + 1) = (4 + (2 + 1)) |
| 7 | 2, 6 | eqtr4i 2253 | . 2 ⊢ (4 + 3) = ((4 + 2) + 1) |
| 8 | df-7 9185 | . . 3 ⊢ 7 = (6 + 1) | |
| 9 | 4p2e6 9265 | . . . 4 ⊢ (4 + 2) = 6 | |
| 10 | 9 | oveq1i 6017 | . . 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 6007 1c1 8011 + caddc 8013 2c2 9172 3c3 9173 4c4 9174 6c6 9176 7c7 9177 |
| 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 8102 ax-1cn 8103 ax-1re 8104 ax-addrcl 8107 ax-addass 8112 |
| 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 2801 df-un 3201 df-in 3203 df-ss 3210 df-sn 3672 df-pr 3673 df-op 3675 df-uni 3889 df-br 4084 df-iota 5278 df-fv 5326 df-ov 6010 df-2 9180 df-3 9181 df-4 9182 df-5 9183 df-6 9184 df-7 9185 |
| This theorem is referenced by: 4p4e8 9267 2lgslem3d 15790 2lgsoddprmlem3d 15804 |
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