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| Mirrors > Home > ILE Home > Th. List > 2t2e4 | GIF version | ||
| Description: 2 times 2 equals 4. (Contributed by NM, 1-Aug-1999.) |
| Ref | Expression |
|---|---|
| 2t2e4 | ⊢ (2 · 2) = 4 |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | 2cn 9192 | . . 3 ⊢ 2 ∈ ℂ | |
| 2 | 1 | 2timesi 9251 | . 2 ⊢ (2 · 2) = (2 + 2) |
| 3 | 2p2e4 9248 | . 2 ⊢ (2 + 2) = 4 | |
| 4 | 2, 3 | eqtri 2250 | 1 ⊢ (2 · 2) = 4 |
| Colors of variables: wff set class |
| Syntax hints: = wceq 1395 (class class class)co 6007 + caddc 8013 · cmul 8015 2c2 9172 4c4 9174 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 106 ax-ia2 107 ax-ia3 108 ax-io 714 ax-5 1493 ax-7 1494 ax-gen 1495 ax-ie1 1539 ax-ie2 1540 ax-8 1550 ax-10 1551 ax-11 1552 ax-i12 1553 ax-bndl 1555 ax-4 1556 ax-17 1572 ax-i9 1576 ax-ial 1580 ax-i5r 1581 ax-ext 2211 ax-resscn 8102 ax-1cn 8103 ax-1re 8104 ax-icn 8105 ax-addcl 8106 ax-addrcl 8107 ax-mulcl 8108 ax-mulcom 8111 ax-addass 8112 ax-mulass 8113 ax-distr 8114 ax-1rid 8117 ax-cnre 8121 |
| This theorem depends on definitions: df-bi 117 df-3an 1004 df-tru 1398 df-nf 1507 df-sb 1809 df-clab 2216 df-cleq 2222 df-clel 2225 df-nfc 2361 df-ral 2513 df-rex 2514 df-v 2801 df-un 3201 df-in 3203 df-ss 3210 df-sn 3672 df-pr 3673 df-op 3675 df-uni 3889 df-br 4084 df-iota 5278 df-fv 5326 df-ov 6010 df-2 9180 df-3 9181 df-4 9182 |
| This theorem is referenced by: 4d2e2 9282 halfpm6th 9342 div4p1lem1div2 9376 3halfnz 9555 decbin0 9728 fldiv4lem1div2uz2 10538 sq2 10869 sq4e2t8 10871 sqoddm1div8 10927 faclbnd2 10976 4bc2eq6 11008 amgm2 11644 sin4lt0 12293 z4even 12442 flodddiv4 12462 flodddiv4t2lthalf 12465 4nprm 12666 2exp4 12969 2exp16 12975 dveflem 15415 sin0pilem2 15471 sinhalfpilem 15480 sincosq1lem 15514 tangtx 15527 sincos4thpi 15529 gausslemma2dlem3 15757 m1lgs 15779 2lgslem1a2 15781 2lgslem3a 15787 2lgslem3b 15788 2lgslem3c 15789 2lgslem3d 15790 ex-fl 16144 |
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