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| Mirrors > Home > ILE Home > Th. List > 1p1e2 | GIF version | ||
| Description: 1 + 1 = 2. (Contributed by NM, 1-Apr-2008.) |
| Ref | Expression |
|---|---|
| 1p1e2 | ⊢ (1 + 1) = 2 |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | df-2 9366 | . 2 ⊢ 2 = (1 + 1) | |
| 2 | 1 | eqcomi 2242 | 1 ⊢ (1 + 1) = 2 |
| Colors of variables: wff set class |
| This proof depends on syntax axioms: = wceq 1402 (class class class)co 6085 1c1 8181 + caddc 8183 2c2 9358 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 106 ax-ia2 107 ax-ia3 108 ax-5 1500 ax-gen 1502 ax-ext 2220 |
| This proof depends on definitions: df-bi 117 df-cleq 2231 df-2 9366 |
| This theorem is used by: 2m1e1 9425 add1p1 9560 sub1m1 9561 nn0n0n1ge2 9720 3halfnz 9748 10p10e20 9881 5t4e20 9888 6t4e24 9892 7t3e21 9896 8t3e24 9902 9t3e27 9909 fz0to3un2pr 10541 fldiv4p1lem1div2 10755 m1modge3gt1 10823 fac2 11185 hash2 11269 s2leng 11577 nn0o1gt2 12691 3lcm2e6woprm 12883 2exp8 13238 2exp11 13239 2exp16 13240 prmlem0 13243 prmlem2 13257 37prm 13258 43prm 13259 83prm 13260 317prm 13263 631prm 13264 1259lem1 13265 1259lem2 13266 1259lem4 13268 1259lem5 13269 ballotfilem2 13280 ballotfilemfc0 13284 ballotfilemfcc 13285 logfac 16090 logbleb 16158 logblt 16159 log2ublem3 16184 log2ublog2 16185 1sgm2ppw 16250 1loopgrvd2fi 16712 2wlklem 16783 clwwlkext2edg 16829 konigsberglem1 16895 konigsberglem2 16896 konigsberglem3 16897 ex-exp 16907 |
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