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Theorem 2p1e3 7821
Description: 2 + 1 = 3. (Contributed by Mario Carneiro, 18-Apr-2015.)
Assertion
Ref Expression
2p1e3  2  +  1  3

Proof of Theorem 2p1e3
StepHypRef Expression
1 df-3 7754 . 2  3  2  +  1
21eqcomi 2041 1  2  +  1  3
Colors of variables: wff set class
Syntax hints:   wceq 1242  (class class class)co 5455   1c1 6712    + caddc 6714   2c2 7744   3c3 7745
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 1333  ax-gen 1335  ax-ext 2019
This theorem depends on definitions:  df-bi 110  df-cleq 2030  df-3 7754
This theorem is referenced by:  1p2e3  7822  cnm2m1cnm3  7953  6t5e30  8223  7t5e35  8228  8t4e32  8233  9t4e36  8240  decbin3  8248
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