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Mirrors > Home > ILE Home > Th. List > df-2 | GIF version |
Description: Define the number 2. (Contributed by NM, 27-May-1999.) |
Ref | Expression |
---|---|
df-2 | ⊢ 2 = (1 + 1) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | c2 8904 | . 2 class 2 | |
2 | c1 7750 | . . 3 class 1 | |
3 | caddc 7752 | . . 3 class + | |
4 | 2, 2, 3 | co 5841 | . 2 class (1 + 1) |
5 | 1, 4 | wceq 1343 | 1 wff 2 = (1 + 1) |
Colors of variables: wff set class |
This definition is referenced by: 2re 8923 0le2 8943 2pos 8944 1p1e2 8970 2p2e4 8980 2times 8981 3p2e5 8994 4p2e6 8996 5p2e7 8999 6p2e8 9002 7p2e9 9004 2nn 9014 1lt2 9022 nneoor 9289 6p6e12 9391 7p5e12 9394 8p2e10 9397 8p4e12 9399 9p2e11 9404 9p3e12 9405 5t2e10 9417 eluz2b1 9535 nn01to3 9551 fztp 10009 fzprval 10013 fztpval 10014 fzo12sn 10148 rebtwn2zlemstep 10184 rebtwn2z 10186 sqval 10509 fac2 10640 bcp1m1 10674 hashprg 10717 binom11 11423 ege2le3 11608 ef4p 11631 efgt1p2 11632 eirraplem 11713 odd2np1lem 11805 opoe 11828 ncoprmgcdne1b 12017 isprm3 12046 prmind2 12048 dvdsnprmd 12053 prmgt1 12060 pockthlem 12282 pockthg 12283 prmunb 12288 dveflem 13287 coskpi 13369 lgslem1 13501 lgsval2lem 13511 lgsdir2lem2 13530 lgsdir2lem3 13531 lgsdirprm 13535 ex-fl 13566 |
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