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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 8803 | . . . . 5 ⊢ 2 = (1 + 1) | |
2 | 1 | oveq2i 5793 | . . . 4 ⊢ (6 + 2) = (6 + (1 + 1)) |
3 | 6cn 8826 | . . . . 5 ⊢ 6 ∈ ℂ | |
4 | ax-1cn 7737 | . . . . 5 ⊢ 1 ∈ ℂ | |
5 | 3, 4, 4 | addassi 7798 | . . . 4 ⊢ ((6 + 1) + 1) = (6 + (1 + 1)) |
6 | 2, 5 | eqtr4i 2164 | . . 3 ⊢ (6 + 2) = ((6 + 1) + 1) |
7 | df-7 8808 | . . . 4 ⊢ 7 = (6 + 1) | |
8 | 7 | oveq1i 5792 | . . 3 ⊢ (7 + 1) = ((6 + 1) + 1) |
9 | 6, 8 | eqtr4i 2164 | . 2 ⊢ (6 + 2) = (7 + 1) |
10 | df-8 8809 | . 2 ⊢ 8 = (7 + 1) | |
11 | 9, 10 | eqtr4i 2164 | 1 ⊢ (6 + 2) = 8 |
Colors of variables: wff set class |
Syntax hints: = wceq 1332 (class class class)co 5782 1c1 7645 + caddc 7647 2c2 8795 6c6 8799 7c7 8800 8c8 8801 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 105 ax-ia2 106 ax-ia3 107 ax-io 699 ax-5 1424 ax-7 1425 ax-gen 1426 ax-ie1 1470 ax-ie2 1471 ax-8 1483 ax-10 1484 ax-11 1485 ax-i12 1486 ax-bndl 1487 ax-4 1488 ax-17 1507 ax-i9 1511 ax-ial 1515 ax-i5r 1516 ax-ext 2122 ax-resscn 7736 ax-1cn 7737 ax-1re 7738 ax-addrcl 7741 ax-addass 7746 |
This theorem depends on definitions: df-bi 116 df-3an 965 df-tru 1335 df-nf 1438 df-sb 1737 df-clab 2127 df-cleq 2133 df-clel 2136 df-nfc 2271 df-rex 2423 df-v 2691 df-un 3080 df-in 3082 df-ss 3089 df-sn 3538 df-pr 3539 df-op 3541 df-uni 3745 df-br 3938 df-iota 5096 df-fv 5139 df-ov 5785 df-2 8803 df-3 8804 df-4 8805 df-5 8806 df-6 8807 df-7 8808 df-8 8809 |
This theorem is referenced by: 6p3e9 8894 6t3e18 9310 |
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