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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 9378 | . . 3 ⊢ 2 ∈ ℂ | |
| 2 | 1 | 2timesi 9437 | . 2 ⊢ (2 · 2) = (2 + 2) |
| 3 | 2p2e4 9434 | . 2 ⊢ (2 + 2) = 4 | |
| 4 | 2, 3 | eqtri 2259 | 1 ⊢ (2 · 2) = 4 |
| Colors of variables: wff set class |
| This proof depends on syntax axioms: = wceq 1402 (class class class)co 6085 + caddc 8183 · cmul 8185 2c2 9358 4c4 9360 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 106 ax-ia2 107 ax-ia3 108 ax-io 721 ax-5 1500 ax-7 1501 ax-gen 1502 ax-ie1 1546 ax-ie2 1547 ax-8 1557 ax-10 1558 ax-11 1559 ax-i12 1560 ax-bndl 1562 ax-4 1563 ax-17 1579 ax-i9 1583 ax-ial 1587 ax-i5r 1588 ax-ext 2220 ax-resscn 8272 ax-1cn 8273 ax-1re 8274 ax-icn 8275 ax-addcl 8276 ax-addrcl 8277 ax-mulcl 8278 ax-mulcom 8281 ax-addass 8282 ax-mulass 8283 ax-distr 8284 ax-1rid 8287 ax-cnre 8291 |
| This proof depends on definitions: df-bi 117 df-3an 1011 df-tru 1405 df-nf 1514 df-sb 1816 df-clab 2225 df-cleq 2231 df-clel 2234 df-nfc 2381 df-ral 2533 df-rex 2534 df-v 2823 df-un 3224 df-in 3226 df-ss 3233 df-sn 3715 df-pr 3716 df-op 3718 df-uni 3936 df-br 4131 df-iota 5337 df-fv 5385 df-ov 6088 df-2 9366 df-3 9367 df-4 9368 |
| This theorem is used by: 4d2e2 9470 halfpm6th 9530 div4p1lem1div2 9564 3halfnz 9748 decbin0 9926 fldiv4lem1div2uz2 10756 sq2 11087 sq4e2t8 11089 sqoddm1div8 11146 faclbnd2 11196 4bc2eq6 11229 amgm2 11901 sin4lt0 12553 z4even 12702 flodddiv4 12722 flodddiv4t2lthalf 12725 4nprm 12926 2exp4 13234 2exp16 13240 5prm 13246 631prm 13264 1259lem1 13265 1259lem4 13268 dveflem 15918 sin0pilem2 15975 sinhalfpilem 15984 sincosq1lem 16018 tangtx 16031 sincos4thpi 16033 log2ublem3 16184 log2ublog2 16185 chtqub 16257 bclbnd 16268 bpos1 16271 bposlem2 16273 bposlem6 16277 bposlem9 16280 gausslemma2dlem3 16348 m1lgs 16370 2lgslem1a2 16372 2lgslem3a 16378 2lgslem3b 16379 2lgslem3c 16380 2lgslem3d 16381 ex-fl 16905 |
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