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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 9372 | . 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 6088 1c1 8186 + caddc 8188 2c2 9364 |
| 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 9372 |
| This theorem is used by: 2m1e1 9431 add1p1 9566 sub1m1 9567 nn0n0n1ge2 9724 3halfnz 9753 10p10e20 9886 5t4e20 9893 6t4e24 9897 7t3e21 9901 8t3e24 9907 9t3e27 9914 fz0to3un2pr 10546 fldiv4p1lem1div2 10760 m1modge3gt1 10828 fac2 11190 hash2 11274 s2leng 11582 nn0o1gt2 12696 3lcm2e6woprm 12888 2exp8 13243 2exp11 13244 2exp16 13245 prmlem0 13248 prmlem2 13262 37prm 13263 43prm 13264 83prm 13265 317prm 13268 631prm 13269 1259lem1 13270 1259lem2 13271 1259lem4 13273 1259lem5 13274 ballotfilem2 13285 ballotfilemfc0 13289 ballotfilemfcc 13290 logfac 16143 logbleb 16214 logblt 16215 log2ublem3 16240 log2ublog2 16241 1sgm2ppw 16306 1loopgrvd2fi 16768 2wlklem 16839 clwwlkext2edg 16885 konigsberglem1 16951 konigsberglem2 16952 konigsberglem3 16953 ex-exp 16963 |
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