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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 9194 | . 2 class 2 | |
| 2 | c1 8033 | . . 3 class 1 | |
| 3 | caddc 8035 | . . 3 class + | |
| 4 | 2, 2, 3 | co 6018 | . 2 class (1 + 1) |
| 5 | 1, 4 | wceq 1397 | 1 wff 2 = (1 + 1) |
| Colors of variables: wff set class |
| This definition is referenced by: 2re 9213 0le2 9233 2pos 9234 1p1e2 9260 2p2e4 9270 2times 9271 3p2e5 9285 4p2e6 9287 5p2e7 9290 6p2e8 9293 7p2e9 9295 2nn 9305 1lt2 9313 nneoor 9582 6p6e12 9684 7p5e12 9687 8p2e10 9690 8p4e12 9692 9p2e11 9697 9p3e12 9698 5t2e10 9710 eluz2b1 9835 nn01to3 9851 fztp 10313 fzprval 10317 fztpval 10318 fzo12sn 10463 fzosplitpr 10480 rebtwn2zlemstep 10513 rebtwn2z 10515 sqval 10860 fac2 10994 bcp1m1 11028 hashprg 11073 binom11 12065 ege2le3 12250 ef4p 12273 efgt1p2 12274 eirraplem 12356 odd2np1lem 12451 opoe 12474 bitsfzolem 12533 ncoprmgcdne1b 12679 isprm3 12708 prmind2 12710 dvdsnprmd 12715 prmgt1 12722 pockthlem 12947 pockthg 12948 prmunb 12953 4sqlem19 13000 2expltfac 13030 gsumpr12val 13501 mulg2 13736 dveflem 15469 coskpi 15591 mersenne 15740 perfectlem2 15743 lgslem1 15748 lgsval2lem 15758 lgsdir2lem2 15777 lgsdir2lem3 15778 lgsdirprm 15782 lgseisen 15822 m1lgs 15833 ex-fl 16368 |
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