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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 9204 | . . 3 ⊢ 2 ∈ ℂ | |
| 2 | 1 | 2timesi 9263 | . 2 ⊢ (2 · 2) = (2 + 2) |
| 3 | 2p2e4 9260 | . 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 6013 + caddc 8025 · cmul 8027 2c2 9184 4c4 9186 |
| 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 8114 ax-1cn 8115 ax-1re 8116 ax-icn 8117 ax-addcl 8118 ax-addrcl 8119 ax-mulcl 8120 ax-mulcom 8123 ax-addass 8124 ax-mulass 8125 ax-distr 8126 ax-1rid 8129 ax-cnre 8133 |
| 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 2802 df-un 3202 df-in 3204 df-ss 3211 df-sn 3673 df-pr 3674 df-op 3676 df-uni 3892 df-br 4087 df-iota 5284 df-fv 5332 df-ov 6016 df-2 9192 df-3 9193 df-4 9194 |
| This theorem is referenced by: 4d2e2 9294 halfpm6th 9354 div4p1lem1div2 9388 3halfnz 9567 decbin0 9740 fldiv4lem1div2uz2 10556 sq2 10887 sq4e2t8 10889 sqoddm1div8 10945 faclbnd2 10994 4bc2eq6 11026 amgm2 11669 sin4lt0 12318 z4even 12467 flodddiv4 12487 flodddiv4t2lthalf 12490 4nprm 12691 2exp4 12994 2exp16 13000 dveflem 15440 sin0pilem2 15496 sinhalfpilem 15505 sincosq1lem 15539 tangtx 15552 sincos4thpi 15554 gausslemma2dlem3 15782 m1lgs 15804 2lgslem1a2 15806 2lgslem3a 15812 2lgslem3b 15813 2lgslem3c 15814 2lgslem3d 15815 ex-fl 16257 |
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