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| Mirrors > Home > ILE Home > Th. List > 2t2e4 | Unicode version | ||
| Description: 2 times 2 equals 4. (Contributed by NM, 1-Aug-1999.) |
| Ref | Expression |
|---|---|
| 2t2e4 |
|
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | 2cn 9273 |
. . 3
| |
| 2 | 1 | 2timesi 9332 |
. 2
|
| 3 | 2p2e4 9329 |
. 2
| |
| 4 | 2, 3 | eqtri 2252 |
1
|
| Colors of variables: wff set class |
| Syntax hints: |
| 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 2213 ax-resscn 8184 ax-1cn 8185 ax-1re 8186 ax-icn 8187 ax-addcl 8188 ax-addrcl 8189 ax-mulcl 8190 ax-mulcom 8193 ax-addass 8194 ax-mulass 8195 ax-distr 8196 ax-1rid 8199 ax-cnre 8203 |
| This theorem depends on definitions: df-bi 117 df-3an 1007 df-tru 1401 df-nf 1510 df-sb 1811 df-clab 2218 df-cleq 2224 df-clel 2227 df-nfc 2364 df-ral 2516 df-rex 2517 df-v 2805 df-un 3205 df-in 3207 df-ss 3214 df-sn 3679 df-pr 3680 df-op 3682 df-uni 3899 df-br 4094 df-iota 5293 df-fv 5341 df-ov 6031 df-2 9261 df-3 9262 df-4 9263 |
| This theorem is referenced by: 4d2e2 9363 halfpm6th 9423 div4p1lem1div2 9457 3halfnz 9638 decbin0 9811 fldiv4lem1div2uz2 10629 sq2 10960 sq4e2t8 10962 sqoddm1div8 11018 faclbnd2 11067 4bc2eq6 11099 amgm2 11758 sin4lt0 12408 z4even 12557 flodddiv4 12577 flodddiv4t2lthalf 12580 4nprm 12781 2exp4 13084 2exp16 13090 dveflem 15537 sin0pilem2 15593 sinhalfpilem 15602 sincosq1lem 15636 tangtx 15649 sincos4thpi 15651 gausslemma2dlem3 15882 m1lgs 15904 2lgslem1a2 15906 2lgslem3a 15912 2lgslem3b 15913 2lgslem3c 15914 2lgslem3d 15915 ex-fl 16439 |
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