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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 9214 | . . 3 ⊢ 2 ∈ ℂ | |
| 2 | 1 | 2timesi 9273 | . 2 ⊢ (2 · 2) = (2 + 2) |
| 3 | 2p2e4 9270 | . 2 ⊢ (2 + 2) = 4 | |
| 4 | 2, 3 | eqtri 2252 | 1 ⊢ (2 · 2) = 4 |
| Colors of variables: wff set class |
| Syntax hints: = wceq 1397 (class class class)co 6018 + caddc 8035 · cmul 8037 2c2 9194 4c4 9196 |
| 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 716 ax-5 1495 ax-7 1496 ax-gen 1497 ax-ie1 1541 ax-ie2 1542 ax-8 1552 ax-10 1553 ax-11 1554 ax-i12 1555 ax-bndl 1557 ax-4 1558 ax-17 1574 ax-i9 1578 ax-ial 1582 ax-i5r 1583 ax-ext 2213 ax-resscn 8124 ax-1cn 8125 ax-1re 8126 ax-icn 8127 ax-addcl 8128 ax-addrcl 8129 ax-mulcl 8130 ax-mulcom 8133 ax-addass 8134 ax-mulass 8135 ax-distr 8136 ax-1rid 8139 ax-cnre 8143 |
| This theorem depends on definitions: df-bi 117 df-3an 1006 df-tru 1400 df-nf 1509 df-sb 1811 df-clab 2218 df-cleq 2224 df-clel 2227 df-nfc 2363 df-ral 2515 df-rex 2516 df-v 2804 df-un 3204 df-in 3206 df-ss 3213 df-sn 3675 df-pr 3676 df-op 3678 df-uni 3894 df-br 4089 df-iota 5286 df-fv 5334 df-ov 6021 df-2 9202 df-3 9203 df-4 9204 |
| This theorem is referenced by: 4d2e2 9304 halfpm6th 9364 div4p1lem1div2 9398 3halfnz 9577 decbin0 9750 fldiv4lem1div2uz2 10567 sq2 10898 sq4e2t8 10900 sqoddm1div8 10956 faclbnd2 11005 4bc2eq6 11037 amgm2 11696 sin4lt0 12346 z4even 12495 flodddiv4 12515 flodddiv4t2lthalf 12518 4nprm 12719 2exp4 13022 2exp16 13028 dveflem 15469 sin0pilem2 15525 sinhalfpilem 15534 sincosq1lem 15568 tangtx 15581 sincos4thpi 15583 gausslemma2dlem3 15811 m1lgs 15833 2lgslem1a2 15835 2lgslem3a 15841 2lgslem3b 15842 2lgslem3c 15843 2lgslem3d 15844 ex-fl 16368 |
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