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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 9308 | . . 3 ⊢ 2 ∈ ℂ | |
| 2 | 1 | 2timesi 9367 | . 2 ⊢ (2 · 2) = (2 + 2) |
| 3 | 2p2e4 9364 | . 2 ⊢ (2 + 2) = 4 | |
| 4 | 2, 3 | eqtri 2253 | 1 ⊢ (2 · 2) = 4 |
| Colors of variables: wff set class |
| Syntax hints: = wceq 1398 (class class class)co 6050 + caddc 8130 · cmul 8132 2c2 9288 4c4 9290 |
| 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 717 ax-5 1496 ax-7 1497 ax-gen 1498 ax-ie1 1542 ax-ie2 1543 ax-8 1553 ax-10 1554 ax-11 1555 ax-i12 1556 ax-bndl 1558 ax-4 1559 ax-17 1575 ax-i9 1579 ax-ial 1583 ax-i5r 1584 ax-ext 2214 ax-resscn 8219 ax-1cn 8220 ax-1re 8221 ax-icn 8222 ax-addcl 8223 ax-addrcl 8224 ax-mulcl 8225 ax-mulcom 8228 ax-addass 8229 ax-mulass 8230 ax-distr 8231 ax-1rid 8234 ax-cnre 8238 |
| This theorem depends on definitions: df-bi 117 df-3an 1007 df-tru 1401 df-nf 1510 df-sb 1812 df-clab 2219 df-cleq 2225 df-clel 2228 df-nfc 2373 df-ral 2525 df-rex 2526 df-v 2815 df-un 3215 df-in 3217 df-ss 3224 df-sn 3695 df-pr 3696 df-op 3698 df-uni 3915 df-br 4110 df-iota 5312 df-fv 5360 df-ov 6053 df-2 9296 df-3 9297 df-4 9298 |
| This theorem is referenced by: 4d2e2 9398 halfpm6th 9458 div4p1lem1div2 9492 3halfnz 9675 decbin0 9848 fldiv4lem1div2uz2 10666 sq2 10997 sq4e2t8 10999 sqoddm1div8 11055 faclbnd2 11104 4bc2eq6 11137 amgm2 11803 sin4lt0 12453 z4even 12602 flodddiv4 12622 flodddiv4t2lthalf 12625 4nprm 12826 2exp4 13129 2exp16 13135 dveflem 15591 sin0pilem2 15647 sinhalfpilem 15656 sincosq1lem 15690 tangtx 15703 sincos4thpi 15705 gausslemma2dlem3 15936 m1lgs 15958 2lgslem1a2 15960 2lgslem3a 15966 2lgslem3b 15967 2lgslem3c 15968 2lgslem3d 15969 ex-fl 16493 |
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