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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 8764 | . 2 class 2 | |
2 | c1 7614 | . . 3 class 1 | |
3 | caddc 7616 | . . 3 class + | |
4 | 2, 2, 3 | co 5767 | . 2 class (1 + 1) |
5 | 1, 4 | wceq 1331 | 1 wff 2 = (1 + 1) |
Colors of variables: wff set class |
This definition is referenced by: 2re 8783 0le2 8803 2pos 8804 1p1e2 8830 2p2e4 8840 2times 8841 3p2e5 8854 4p2e6 8856 5p2e7 8859 6p2e8 8862 7p2e9 8864 2nn 8874 1lt2 8882 nneoor 9146 6p6e12 9248 7p5e12 9251 8p2e10 9254 8p4e12 9256 9p2e11 9261 9p3e12 9262 5t2e10 9274 eluz2b1 9388 nn01to3 9402 fztp 9851 fzprval 9855 fztpval 9856 fzo12sn 9987 rebtwn2zlemstep 10023 rebtwn2z 10025 sqval 10344 fac2 10470 bcp1m1 10504 hashprg 10547 binom11 11248 ege2le3 11366 ef4p 11389 efgt1p2 11390 eirraplem 11472 odd2np1lem 11558 opoe 11581 ncoprmgcdne1b 11759 isprm3 11788 prmind2 11790 dvdsnprmd 11795 prmgt1 11801 dveflem 12844 coskpi 12918 ex-fl 12926 |
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