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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 9354 | . . 3 ⊢ 2 ∈ ℂ | |
| 2 | 1 | 2timesi 9413 | . 2 ⊢ (2 · 2) = (2 + 2) |
| 3 | 2p2e4 9410 | . 2 ⊢ (2 + 2) = 4 | |
| 4 | 2, 3 | eqtri 2259 | 1 ⊢ (2 · 2) = 4 |
| Colors of variables: wff set class |
| Syntax hints: = wceq 1402 (class class class)co 6075 + caddc 8172 · cmul 8174 2c2 9334 4c4 9336 |
| 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 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 8261 ax-1cn 8262 ax-1re 8263 ax-icn 8264 ax-addcl 8265 ax-addrcl 8266 ax-mulcl 8267 ax-mulcom 8270 ax-addass 8271 ax-mulass 8272 ax-distr 8273 ax-1rid 8276 ax-cnre 8280 |
| This theorem 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 3711 df-pr 3712 df-op 3714 df-uni 3931 df-br 4126 df-iota 5332 df-fv 5380 df-ov 6078 df-2 9342 df-3 9343 df-4 9344 |
| This theorem is referenced by: 4d2e2 9444 halfpm6th 9504 div4p1lem1div2 9538 3halfnz 9722 decbin0 9895 fldiv4lem1div2uz2 10719 sq2 11050 sq4e2t8 11052 sqoddm1div8 11109 faclbnd2 11158 4bc2eq6 11191 amgm2 11862 sin4lt0 12512 z4even 12661 flodddiv4 12681 flodddiv4t2lthalf 12684 4nprm 12885 2exp4 13188 2exp16 13194 dveflem 15750 sin0pilem2 15806 sinhalfpilem 15815 sincosq1lem 15849 tangtx 15862 sincos4thpi 15864 gausslemma2dlem3 16096 m1lgs 16118 2lgslem1a2 16120 2lgslem3a 16126 2lgslem3b 16127 2lgslem3c 16128 2lgslem3d 16129 ex-fl 16653 |
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