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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 8970 | . 2 class 2 | |
2 | c1 7812 | . . 3 class 1 | |
3 | caddc 7814 | . . 3 class + | |
4 | 2, 2, 3 | co 5875 | . 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 8989 0le2 9009 2pos 9010 1p1e2 9036 2p2e4 9046 2times 9047 3p2e5 9060 4p2e6 9062 5p2e7 9065 6p2e8 9068 7p2e9 9070 2nn 9080 1lt2 9088 nneoor 9355 6p6e12 9457 7p5e12 9460 8p2e10 9463 8p4e12 9465 9p2e11 9470 9p3e12 9471 5t2e10 9483 eluz2b1 9601 nn01to3 9617 fztp 10078 fzprval 10082 fztpval 10083 fzo12sn 10217 rebtwn2zlemstep 10253 rebtwn2z 10255 sqval 10578 fac2 10711 bcp1m1 10745 hashprg 10788 binom11 11494 ege2le3 11679 ef4p 11702 efgt1p2 11703 eirraplem 11784 odd2np1lem 11877 opoe 11900 ncoprmgcdne1b 12089 isprm3 12118 prmind2 12120 dvdsnprmd 12125 prmgt1 12132 pockthlem 12354 pockthg 12355 prmunb 12360 mulg2 12992 dveflem 14190 coskpi 14272 lgslem1 14404 lgsval2lem 14414 lgsdir2lem2 14433 lgsdir2lem3 14434 lgsdirprm 14438 m1lgs 14455 ex-fl 14480 |
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