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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 9142 |
. . 3
| |
| 2 | 1 | 2timesi 9201 |
. 2
|
| 3 | 2p2e4 9198 |
. 2
| |
| 4 | 2, 3 | eqtri 2228 |
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 711 ax-5 1471 ax-7 1472 ax-gen 1473 ax-ie1 1517 ax-ie2 1518 ax-8 1528 ax-10 1529 ax-11 1530 ax-i12 1531 ax-bndl 1533 ax-4 1534 ax-17 1550 ax-i9 1554 ax-ial 1558 ax-i5r 1559 ax-ext 2189 ax-resscn 8052 ax-1cn 8053 ax-1re 8054 ax-icn 8055 ax-addcl 8056 ax-addrcl 8057 ax-mulcl 8058 ax-mulcom 8061 ax-addass 8062 ax-mulass 8063 ax-distr 8064 ax-1rid 8067 ax-cnre 8071 |
| This theorem depends on definitions: df-bi 117 df-3an 983 df-tru 1376 df-nf 1485 df-sb 1787 df-clab 2194 df-cleq 2200 df-clel 2203 df-nfc 2339 df-ral 2491 df-rex 2492 df-v 2778 df-un 3178 df-in 3180 df-ss 3187 df-sn 3649 df-pr 3650 df-op 3652 df-uni 3865 df-br 4060 df-iota 5251 df-fv 5298 df-ov 5970 df-2 9130 df-3 9131 df-4 9132 |
| This theorem is referenced by: 4d2e2 9232 halfpm6th 9292 div4p1lem1div2 9326 3halfnz 9505 decbin0 9678 fldiv4lem1div2uz2 10486 sq2 10817 sq4e2t8 10819 sqoddm1div8 10875 faclbnd2 10924 4bc2eq6 10956 amgm2 11544 sin4lt0 12193 z4even 12342 flodddiv4 12362 flodddiv4t2lthalf 12365 4nprm 12566 2exp4 12869 2exp16 12875 dveflem 15313 sin0pilem2 15369 sinhalfpilem 15378 sincosq1lem 15412 tangtx 15425 sincos4thpi 15427 gausslemma2dlem3 15655 m1lgs 15677 2lgslem1a2 15679 2lgslem3a 15685 2lgslem3b 15686 2lgslem3c 15687 2lgslem3d 15688 ex-fl 15861 |
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