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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 8900 | . 2 class 2 | |
2 | c1 7746 | . . 3 class 1 | |
3 | caddc 7748 | . . 3 class + | |
4 | 2, 2, 3 | co 5837 | . 2 class (1 + 1) |
5 | 1, 4 | wceq 1342 | 1 wff 2 = (1 + 1) |
Colors of variables: wff set class |
This definition is referenced by: 2re 8919 0le2 8939 2pos 8940 1p1e2 8966 2p2e4 8976 2times 8977 3p2e5 8990 4p2e6 8992 5p2e7 8995 6p2e8 8998 7p2e9 9000 2nn 9010 1lt2 9018 nneoor 9285 6p6e12 9387 7p5e12 9390 8p2e10 9393 8p4e12 9395 9p2e11 9400 9p3e12 9401 5t2e10 9413 eluz2b1 9531 nn01to3 9547 fztp 10004 fzprval 10008 fztpval 10009 fzo12sn 10143 rebtwn2zlemstep 10179 rebtwn2z 10181 sqval 10504 fac2 10634 bcp1m1 10668 hashprg 10711 binom11 11417 ege2le3 11602 ef4p 11625 efgt1p2 11626 eirraplem 11707 odd2np1lem 11798 opoe 11821 ncoprmgcdne1b 12010 isprm3 12039 prmind2 12041 dvdsnprmd 12046 prmgt1 12053 pockthlem 12275 pockthg 12276 prmunb 12281 dveflem 13254 coskpi 13336 ex-fl 13469 |
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