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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 9033 | . 2 class 2 | |
2 | c1 7873 | . . 3 class 1 | |
3 | caddc 7875 | . . 3 class + | |
4 | 2, 2, 3 | co 5918 | . 2 class (1 + 1) |
5 | 1, 4 | wceq 1364 | 1 wff 2 = (1 + 1) |
Colors of variables: wff set class |
This definition is referenced by: 2re 9052 0le2 9072 2pos 9073 1p1e2 9099 2p2e4 9109 2times 9110 3p2e5 9123 4p2e6 9125 5p2e7 9128 6p2e8 9131 7p2e9 9133 2nn 9143 1lt2 9151 nneoor 9419 6p6e12 9521 7p5e12 9524 8p2e10 9527 8p4e12 9529 9p2e11 9534 9p3e12 9535 5t2e10 9547 eluz2b1 9666 nn01to3 9682 fztp 10144 fzprval 10148 fztpval 10149 fzo12sn 10284 rebtwn2zlemstep 10321 rebtwn2z 10323 sqval 10668 fac2 10802 bcp1m1 10836 hashprg 10879 binom11 11629 ege2le3 11814 ef4p 11837 efgt1p2 11838 eirraplem 11920 odd2np1lem 12013 opoe 12036 ncoprmgcdne1b 12227 isprm3 12256 prmind2 12258 dvdsnprmd 12263 prmgt1 12270 pockthlem 12494 pockthg 12495 prmunb 12500 4sqlem19 12547 gsumpr12val 12983 mulg2 13201 dveflem 14872 coskpi 14983 lgslem1 15116 lgsval2lem 15126 lgsdir2lem2 15145 lgsdir2lem3 15146 lgsdirprm 15150 lgseisen 15190 m1lgs 15192 ex-fl 15217 |
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