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Theorem 2p1e3 8549
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 8482 . 2 3 = (2 + 1)
21eqcomi 2092 1 (2 + 1) = 3
Colors of variables: wff set class
Syntax hints:   = wceq 1289  (class class class)co 5652  1c1 7351   + caddc 7353  2c2 8473  3c3 8474
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 1381  ax-gen 1383  ax-ext 2070
This theorem depends on definitions:  df-bi 115  df-cleq 2081  df-3 8482
This theorem is referenced by:  1p2e3  8550  cnm2m1cnm3  8667  6t5e30  8983  7t5e35  8988  8t4e32  8993  9t4e36  9000  decbin3  9018  m1modge3gt1  9778  fac3  10140  hash3  10221  nn0o1gt2  11183  flodddiv4  11212
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