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Mirrors > Home > ILE Home > Th. List > 8p1e9 | GIF version |
Description: 8 + 1 = 9. (Contributed by Mario Carneiro, 18-Apr-2015.) |
Ref | Expression |
---|---|
8p1e9 | ⊢ (8 + 1) = 9 |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | df-9 8810 | . 2 ⊢ 9 = (8 + 1) | |
2 | 1 | eqcomi 2144 | 1 ⊢ (8 + 1) = 9 |
Colors of variables: wff set class |
Syntax hints: = wceq 1332 (class class class)co 5782 1c1 7645 + caddc 7647 8c8 8801 9c9 8802 |
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-5 1424 ax-gen 1426 ax-ext 2122 |
This theorem depends on definitions: df-bi 116 df-cleq 2133 df-9 8810 |
This theorem is referenced by: cos2bnd 11503 |
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