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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 8779 | . 2 | |
2 | 1 | eqcomi 2141 | 1 |
Colors of variables: wff set class |
Syntax hints: wceq 1331 (class class class)co 5767 c1 7614 caddc 7616 c8 8770 c9 8771 |
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 1423 ax-gen 1425 ax-ext 2119 |
This theorem depends on definitions: df-bi 116 df-cleq 2130 df-9 8779 |
This theorem is referenced by: cos2bnd 11456 |
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