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Mirrors > Home > ILE Home > Th. List > 2p2e4 | Unicode version |
Description: Two plus two equals four. For more information, see "2+2=4 Trivia" on the Metamath Proof Explorer Home Page: https://us.metamath.org/mpeuni/mmset.html#trivia. (Contributed by NM, 27-May-1999.) |
Ref | Expression |
---|---|
2p2e4 |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | df-2 8907 | . . 3 | |
2 | 1 | oveq2i 5847 | . 2 |
3 | df-4 8909 | . . 3 | |
4 | df-3 8908 | . . . 4 | |
5 | 4 | oveq1i 5846 | . . 3 |
6 | 2cn 8919 | . . . 4 | |
7 | ax-1cn 7837 | . . . 4 | |
8 | 6, 7, 7 | addassi 7898 | . . 3 |
9 | 3, 5, 8 | 3eqtri 2189 | . 2 |
10 | 2, 9 | eqtr4i 2188 | 1 |
Colors of variables: wff set class |
Syntax hints: wceq 1342 (class class class)co 5836 c1 7745 caddc 7747 c2 8899 c3 8900 c4 8901 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 105 ax-ia2 106 ax-ia3 107 ax-io 699 ax-5 1434 ax-7 1435 ax-gen 1436 ax-ie1 1480 ax-ie2 1481 ax-8 1491 ax-10 1492 ax-11 1493 ax-i12 1494 ax-bndl 1496 ax-4 1497 ax-17 1513 ax-i9 1517 ax-ial 1521 ax-i5r 1522 ax-ext 2146 ax-resscn 7836 ax-1cn 7837 ax-1re 7838 ax-addrcl 7841 ax-addass 7846 |
This theorem depends on definitions: df-bi 116 df-3an 969 df-tru 1345 df-nf 1448 df-sb 1750 df-clab 2151 df-cleq 2157 df-clel 2160 df-nfc 2295 df-rex 2448 df-v 2723 df-un 3115 df-in 3117 df-ss 3124 df-sn 3576 df-pr 3577 df-op 3579 df-uni 3784 df-br 3977 df-iota 5147 df-fv 5190 df-ov 5839 df-2 8907 df-3 8908 df-4 8909 |
This theorem is referenced by: 2t2e4 9002 i4 10547 4bc2eq6 10676 resqrexlemover 10938 resqrexlemcalc1 10942 ef01bndlem 11683 6gcd4e2 11913 pythagtriplem1 12174 |
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