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Theorem gbpart7 48864
Description: The (weak) Goldbach partition of 7. (Contributed by AV, 20-Jul-2020.)
Assertion
Ref Expression
gbpart7 7 = ((2 + 2) + 3)

Proof of Theorem gbpart7
StepHypRef Expression
1 2p2e4 12477 . . 3 (2 + 2) = 4
21oveq1i 7430 . 2 ((2 + 2) + 3) = (4 + 3)
3 4p3e7 12496 . 2 (4 + 3) = 7
42, 3eqtr2i 2785 1 7 = ((2 + 2) + 3)
Colors of variables:    wff setvar class
This proof depends on syntax axioms:   = wceq 1570  (class class class)co 7420   + caddc 11203  2c2 12397  3c3 12398  4c4 12399  7c7 12402
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 2733  ax-1cn 11258  ax-addcl 11260  ax-addass 11265
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 2740  df-cleq 2753  df-clel 2836  df-rab 3414  df-v 3453  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 6494  df-fv 6546  df-ov 7423  df-2 12405  df-3 12406  df-4 12407  df-5 12408  df-6 12409  df-7 12410
This theorem is used by:  7gbow  48869
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