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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 7980 | . 2 ⊢ 9 = (8 + 1) | |
2 | 1 | eqcomi 2044 | 1 ⊢ (8 + 1) = 9 |
Colors of variables: wff set class |
Syntax hints: = wceq 1243 (class class class)co 5512 1c1 6890 + caddc 6892 8c8 7970 9c9 7971 |
This theorem was proved from axioms: ax-1 5 ax-2 6 ax-mp 7 ax-ia1 99 ax-ia2 100 ax-ia3 101 ax-5 1336 ax-gen 1338 ax-ext 2022 |
This theorem depends on definitions: df-bi 110 df-cleq 2033 df-9 7980 |
This theorem is referenced by: (None) |
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