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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 9184 | . 2 class 2 | |
| 2 | c1 8023 | . . 3 class 1 | |
| 3 | caddc 8025 | . . 3 class + | |
| 4 | 2, 2, 3 | co 6013 | . 2 class (1 + 1) |
| 5 | 1, 4 | wceq 1395 | 1 wff 2 = (1 + 1) |
| Colors of variables: wff set class |
| This definition is referenced by: 2re 9203 0le2 9223 2pos 9224 1p1e2 9250 2p2e4 9260 2times 9261 3p2e5 9275 4p2e6 9277 5p2e7 9280 6p2e8 9283 7p2e9 9285 2nn 9295 1lt2 9303 nneoor 9572 6p6e12 9674 7p5e12 9677 8p2e10 9680 8p4e12 9682 9p2e11 9687 9p3e12 9688 5t2e10 9700 eluz2b1 9825 nn01to3 9841 fztp 10303 fzprval 10307 fztpval 10308 fzo12sn 10452 fzosplitpr 10469 rebtwn2zlemstep 10502 rebtwn2z 10504 sqval 10849 fac2 10983 bcp1m1 11017 hashprg 11062 binom11 12037 ege2le3 12222 ef4p 12245 efgt1p2 12246 eirraplem 12328 odd2np1lem 12423 opoe 12446 bitsfzolem 12505 ncoprmgcdne1b 12651 isprm3 12680 prmind2 12682 dvdsnprmd 12687 prmgt1 12694 pockthlem 12919 pockthg 12920 prmunb 12925 4sqlem19 12972 2expltfac 13002 gsumpr12val 13473 mulg2 13708 dveflem 15440 coskpi 15562 mersenne 15711 perfectlem2 15714 lgslem1 15719 lgsval2lem 15729 lgsdir2lem2 15748 lgsdir2lem3 15749 lgsdirprm 15753 lgseisen 15793 m1lgs 15804 ex-fl 16257 |
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