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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 8969 | . 2 class 2 | |
2 | c1 7811 | . . 3 class 1 | |
3 | caddc 7813 | . . 3 class + | |
4 | 2, 2, 3 | co 5874 | . 2 class (1 + 1) |
5 | 1, 4 | wceq 1353 | 1 wff 2 = (1 + 1) |
Colors of variables: wff set class |
This definition is referenced by: 2re 8988 0le2 9008 2pos 9009 1p1e2 9035 2p2e4 9045 2times 9046 3p2e5 9059 4p2e6 9061 5p2e7 9064 6p2e8 9067 7p2e9 9069 2nn 9079 1lt2 9087 nneoor 9354 6p6e12 9456 7p5e12 9459 8p2e10 9462 8p4e12 9464 9p2e11 9469 9p3e12 9470 5t2e10 9482 eluz2b1 9600 nn01to3 9616 fztp 10077 fzprval 10081 fztpval 10082 fzo12sn 10216 rebtwn2zlemstep 10252 rebtwn2z 10254 sqval 10577 fac2 10710 bcp1m1 10744 hashprg 10787 binom11 11493 ege2le3 11678 ef4p 11701 efgt1p2 11702 eirraplem 11783 odd2np1lem 11876 opoe 11899 ncoprmgcdne1b 12088 isprm3 12117 prmind2 12119 dvdsnprmd 12124 prmgt1 12131 pockthlem 12353 pockthg 12354 prmunb 12359 mulg2 12991 dveflem 14157 coskpi 14239 lgslem1 14371 lgsval2lem 14381 lgsdir2lem2 14400 lgsdir2lem3 14401 lgsdirprm 14405 m1lgs 14422 ex-fl 14447 |
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