Theorem gbpart9 43941

Description: The (strong) Goldbach partition of 9. (Contributed by AV, 26-Jul-2020.)

Assertion

Ref	Expression
gbpart9	⊢ 9 = ((3 + 3) + 3)

Proof of Theorem gbpart9

Step	Hyp	Ref	Expression
1		3p3e6 11792	. . 3 ⊢ (3 + 3) = 6
2	1	oveq1i 7168	. 2 ⊢ ((3 + 3) + 3) = (6 + 3)
3		6p3e9 11800	. 2 ⊢ (6 + 3) = 9
4	2, 3	eqtr2i 2847	1 ⊢ 9 = ((3 + 3) + 3)

Syntax hints:   = wceq 1537  (class class class)co 7158   + caddc 10542  3c3 11696  6c6 11699  9c9 11702

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1796  ax-4 1810  ax-5 1911  ax-6 1970  ax-7 2015  ax-8 2116  ax-9 2124  ax-10 2145  ax-11 2161  ax-12 2177  ax-ext 2795  ax-1cn 10597  ax-addcl 10599  ax-addass 10604

This theorem depends on definitions:  df-bi 209  df-an 399  df-or 844  df-3an 1085  df-tru 1540  df-ex 1781  df-nf 1785  df-sb 2070  df-clab 2802  df-cleq 2816  df-clel 2895  df-nfc 2965  df-rab 3149  df-v 3498  df-dif 3941  df-un 3943  df-in 3945  df-ss 3954  df-nul 4294  df-if 4470  df-sn 4570  df-pr 4572  df-op 4576  df-uni 4841  df-br 5069  df-iota 6316  df-fv 6365  df-ov 7161  df-2 11703  df-3 11704  df-4 11705  df-5 11706  df-6 11707  df-7 11708  df-8 11709  df-9 11710

This theorem is referenced by:  9gbo  43946