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Mirrors > Home > ILE Home > Th. List > 4p4e8 | GIF version |
Description: 4 + 4 = 8. (Contributed by NM, 11-May-2004.) |
Ref | Expression |
---|---|
4p4e8 | ⊢ (4 + 4) = 8 |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | df-4 8100 | . . . 4 ⊢ 4 = (3 + 1) | |
2 | 1 | oveq2i 5543 | . . 3 ⊢ (4 + 4) = (4 + (3 + 1)) |
3 | 4cn 8117 | . . . 4 ⊢ 4 ∈ ℂ | |
4 | 3cn 8114 | . . . 4 ⊢ 3 ∈ ℂ | |
5 | ax-1cn 7069 | . . . 4 ⊢ 1 ∈ ℂ | |
6 | 3, 4, 5 | addassi 7127 | . . 3 ⊢ ((4 + 3) + 1) = (4 + (3 + 1)) |
7 | 2, 6 | eqtr4i 2104 | . 2 ⊢ (4 + 4) = ((4 + 3) + 1) |
8 | df-8 8104 | . . 3 ⊢ 8 = (7 + 1) | |
9 | 4p3e7 8176 | . . . 4 ⊢ (4 + 3) = 7 | |
10 | 9 | oveq1i 5542 | . . 3 ⊢ ((4 + 3) + 1) = (7 + 1) |
11 | 8, 10 | eqtr4i 2104 | . 2 ⊢ 8 = ((4 + 3) + 1) |
12 | 7, 11 | eqtr4i 2104 | 1 ⊢ (4 + 4) = 8 |
Colors of variables: wff set class |
Syntax hints: = wceq 1284 (class class class)co 5532 1c1 6982 + caddc 6984 3c3 8090 4c4 8091 7c7 8094 8c8 8095 |
This theorem was proved from axioms: ax-1 5 ax-2 6 ax-mp 7 ax-ia1 104 ax-ia2 105 ax-ia3 106 ax-io 662 ax-5 1376 ax-7 1377 ax-gen 1378 ax-ie1 1422 ax-ie2 1423 ax-8 1435 ax-10 1436 ax-11 1437 ax-i12 1438 ax-bndl 1439 ax-4 1440 ax-17 1459 ax-i9 1463 ax-ial 1467 ax-i5r 1468 ax-ext 2063 ax-resscn 7068 ax-1cn 7069 ax-1re 7070 ax-addrcl 7073 ax-addass 7078 |
This theorem depends on definitions: df-bi 115 df-3an 921 df-tru 1287 df-nf 1390 df-sb 1686 df-clab 2068 df-cleq 2074 df-clel 2077 df-nfc 2208 df-rex 2354 df-v 2603 df-un 2977 df-in 2979 df-ss 2986 df-sn 3404 df-pr 3405 df-op 3407 df-uni 3602 df-br 3786 df-iota 4887 df-fv 4930 df-ov 5535 df-2 8098 df-3 8099 df-4 8100 df-5 8101 df-6 8102 df-7 8103 df-8 8104 |
This theorem is referenced by: 4t2e8 8190 |
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