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Mirrors > Home > ILE Home > Th. List > 8p1e9 | Unicode version |
Description: 8 + 1 = 9. (Contributed by Mario Carneiro, 18-Apr-2015.) |
Ref | Expression |
---|---|
8p1e9 |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | df-9 8105 | . 2 | |
2 | 1 | eqcomi 2085 | 1 |
Colors of variables: wff set class |
Syntax hints: wceq 1284 (class class class)co 5532 c1 6982 caddc 6984 c8 8095 c9 8096 |
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-5 1376 ax-gen 1378 ax-ext 2063 |
This theorem depends on definitions: df-bi 115 df-cleq 2074 df-9 8105 |
This theorem is referenced by: (None) |
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