| Mathbox for Alexander van der Vekens |
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| Mirrors > Home > MPE Home > Th. List > Mathboxes > gbpart7 | Structured version Visualization version GIF version | ||
| Description: The (weak) Goldbach partition of 7. (Contributed by AV, 20-Jul-2020.) |
| Ref | Expression |
|---|---|
| gbpart7 | ⊢ 7 = ((2 + 2) + 3) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | 2p2e4 12490 | . . 3 ⊢ (2 + 2) = 4 | |
| 2 | 1 | oveq1i 7440 | . 2 ⊢ ((2 + 2) + 3) = (4 + 3) |
| 3 | 4p3e7 12509 | . 2 ⊢ (4 + 3) = 7 | |
| 4 | 2, 3 | eqtr2i 2787 | 1 ⊢ 7 = ((2 + 2) + 3) |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: = wceq 1569 (class class class)co 7430 + caddc 11216 2c2 12410 3c3 12411 4c4 12412 7c7 12415 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1827 ax-4 1841 ax-5 1944 ax-6 2001 ax-7 2042 ax-8 2148 ax-9 2156 ax-ext 2735 ax-1cn 11271 ax-addcl 11273 ax-addass 11278 |
| This proof depends on definitions: df-bi 210 df-an 402 df-or 862 df-3an 1105 df-tru 1572 df-fal 1582 df-ex 1812 df-sb 2101 df-clab 2742 df-cleq 2755 df-clel 2839 df-rab 3417 df-v 3456 df-ss 3901 df-dif 4050 df-un 4154 df-nul 4282 df-if 4486 df-sn 4589 df-pr 4591 df-op 4839 df-uni 4871 df-br 5107 df-iota 6501 df-fv 6555 df-ov 7433 df-2 12418 df-3 12419 df-4 12420 df-5 12421 df-6 12422 df-7 12423 |
| This theorem is used by: 7gbow 49012 |
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