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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 9213 | . . 3 ⊢ 2 ∈ ℂ | |
| 2 | 1 | 2timesi 9272 | . 2 ⊢ (2 · 2) = (2 + 2) |
| 3 | 2p2e4 9269 | . 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 6017 + caddc 8034 · cmul 8036 2c2 9193 4c4 9195 |
| 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 8123 ax-1cn 8124 ax-1re 8125 ax-icn 8126 ax-addcl 8127 ax-addrcl 8128 ax-mulcl 8129 ax-mulcom 8132 ax-addass 8133 ax-mulass 8134 ax-distr 8135 ax-1rid 8138 ax-cnre 8142 |
| 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 6020 df-2 9201 df-3 9202 df-4 9203 |
| This theorem is referenced by: 4d2e2 9303 halfpm6th 9363 div4p1lem1div2 9397 3halfnz 9576 decbin0 9749 fldiv4lem1div2uz2 10565 sq2 10896 sq4e2t8 10898 sqoddm1div8 10954 faclbnd2 11003 4bc2eq6 11035 amgm2 11678 sin4lt0 12327 z4even 12476 flodddiv4 12496 flodddiv4t2lthalf 12499 4nprm 12700 2exp4 13003 2exp16 13009 dveflem 15449 sin0pilem2 15505 sinhalfpilem 15514 sincosq1lem 15548 tangtx 15561 sincos4thpi 15563 gausslemma2dlem3 15791 m1lgs 15813 2lgslem1a2 15815 2lgslem3a 15821 2lgslem3b 15822 2lgslem3c 15823 2lgslem3d 15824 ex-fl 16321 |
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