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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 |
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Step | Hyp | Ref | Expression |
---|---|---|---|
1 | 2cn 8815 |
. . 3
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2 | 1 | 2timesi 8874 |
. 2
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3 | 2p2e4 8871 |
. 2
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4 | 2, 3 | eqtri 2161 |
1
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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 105 ax-ia2 106 ax-ia3 107 ax-io 699 ax-5 1424 ax-7 1425 ax-gen 1426 ax-ie1 1470 ax-ie2 1471 ax-8 1483 ax-10 1484 ax-11 1485 ax-i12 1486 ax-bndl 1487 ax-4 1488 ax-17 1507 ax-i9 1511 ax-ial 1515 ax-i5r 1516 ax-ext 2122 ax-resscn 7736 ax-1cn 7737 ax-1re 7738 ax-icn 7739 ax-addcl 7740 ax-addrcl 7741 ax-mulcl 7742 ax-mulcom 7745 ax-addass 7746 ax-mulass 7747 ax-distr 7748 ax-1rid 7751 ax-cnre 7755 |
This theorem depends on definitions: df-bi 116 df-3an 965 df-tru 1335 df-nf 1438 df-sb 1737 df-clab 2127 df-cleq 2133 df-clel 2136 df-nfc 2271 df-ral 2422 df-rex 2423 df-v 2691 df-un 3080 df-in 3082 df-ss 3089 df-sn 3538 df-pr 3539 df-op 3541 df-uni 3745 df-br 3938 df-iota 5096 df-fv 5139 df-ov 5785 df-2 8803 df-3 8804 df-4 8805 |
This theorem is referenced by: 4d2e2 8904 halfpm6th 8964 div4p1lem1div2 8997 3halfnz 9172 decbin0 9345 sq2 10419 sq4e2t8 10421 sqoddm1div8 10475 faclbnd2 10520 4bc2eq6 10552 amgm2 10922 sin4lt0 11509 z4even 11649 flodddiv4 11667 flodddiv4t2lthalf 11670 4nprm 11846 dveflem 12895 sin0pilem2 12911 sinhalfpilem 12920 sincosq1lem 12954 tangtx 12967 sincos4thpi 12969 ex-fl 13108 |
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