Theorem problem1 35400

Description: Practice problem 1. Clues: 5p4e9 12403 3p2e5 12396 eqtri 2753 oveq1i 7429. (Contributed by Filip Cernatescu, 16-Mar-2019.) (Proof modification is discouraged.)

Assertion

Ref	Expression
problem1	⊢ ((3 + 2) + 4) = 9

Proof of Theorem problem1

Step	Hyp	Ref	Expression
1		3p2e5 12396	. . 3 ⊢ (3 + 2) = 5
2	1	oveq1i 7429	. 2 ⊢ ((3 + 2) + 4) = (5 + 4)
3		5p4e9 12403	. 2 ⊢ (5 + 4) = 9
4	2, 3	eqtri 2753	1 ⊢ ((3 + 2) + 4) = 9

Syntax hints:   = wceq 1533  (class class class)co 7419   + caddc 11143  2c2 12300  3c3 12301  4c4 12302  5c5 12303  9c9 12307

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1789  ax-4 1803  ax-5 1905  ax-6 1963  ax-7 2003  ax-8 2100  ax-9 2108  ax-ext 2696  ax-1cn 11198  ax-addcl 11200  ax-addass 11205

This theorem depends on definitions:  df-bi 206  df-an 395  df-or 846  df-3an 1086  df-tru 1536  df-fal 1546  df-ex 1774  df-sb 2060  df-clab 2703  df-cleq 2717  df-clel 2802  df-rab 3419  df-v 3463  df-dif 3947  df-un 3949  df-ss 3961  df-nul 4323  df-if 4531  df-sn 4631  df-pr 4633  df-op 4637  df-uni 4910  df-br 5150  df-iota 6501  df-fv 6557  df-ov 7422  df-2 12308  df-3 12309  df-4 12310  df-5 12311  df-6 12312  df-7 12313  df-8 12314  df-9 12315

This theorem is referenced by: (None)