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Theorem problem1 36247
Description: Practice problem 1. Clues: 5p4e9 12425 3p2e5 12418 eqtri 2783 oveq1i 7424. (Contributed by Filip Cernatescu, 16-Mar-2019.) (Proof modification is discouraged.)
Assertion
Ref Expression
problem1 ((3 + 2) + 4) = 9

Proof of Theorem problem1
StepHypRef Expression
1 3p2e5 12418 . . 3 (3 + 2) = 5
21oveq1i 7424 . 2 ((3 + 2) + 4) = (5 + 4)
3 5p4e9 12425 . 2 (5 + 4) = 9
42, 3eqtri 2783 1 ((3 + 2) + 4) = 9
Colors of variables:    wff setvar class
This proof depends on syntax axioms:   = wceq 1570  (class class class)co 7414   + caddc 11130  2c2 12322  3c3 12323  4c4 12324  5c5 12325  9c9 12329
This proof depends on axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1828  ax-4 1842  ax-5 1943  ax-6 2000  ax-7 2041  ax-8 2147  ax-9 2155  ax-ext 2732  ax-1cn 11185  ax-addcl 11187  ax-addass 11192
This proof depends on definitions:  df-bi 210  df-an 402  df-or 862  df-3an 1105  df-tru 1573  df-fal 1583  df-ex 1813  df-sb 2100  df-clab 2739  df-cleq 2752  df-clel 2835  df-rab 3413  df-v 3452  df-dif 3902  df-un 3904  df-ss 3916  df-nul 4280  df-if 4483  df-sn 4585  df-pr 4587  df-op 4591  df-uni 4868  df-br 5104  df-iota 6489  df-fv 6541  df-ov 7417  df-2 12330  df-3 12331  df-4 12332  df-5 12333  df-6 12334  df-7 12335  df-8 12336  df-9 12337
This theorem is used by: (None)
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