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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 9365 | . 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 8180 + caddc 8182 2c2 9357 |
| 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 9365 |
| This theorem is used by: 2m1e1 9424 add1p1 9559 sub1m1 9560 nn0n0n1ge2 9719 3halfnz 9747 10p10e20 9880 5t4e20 9887 6t4e24 9891 7t3e21 9895 8t3e24 9901 9t3e27 9908 fz0to3un2pr 10540 fldiv4p1lem1div2 10753 m1modge3gt1 10821 fac2 11183 hash2 11267 s2leng 11575 nn0o1gt2 12688 3lcm2e6woprm 12880 2exp8 13235 2exp11 13236 2exp16 13237 prmlem0 13240 prmlem2 13254 37prm 13255 43prm 13256 83prm 13257 317prm 13260 631prm 13261 1259lem1 13262 1259lem2 13263 1259lem4 13265 1259lem5 13266 ballotfilem2 13277 ballotfilemfc0 13281 ballotfilemfcc 13282 logfac 16048 logbleb 16116 logblt 16117 log2ublem3 16142 log2ublog2 16143 1sgm2ppw 16190 1loopgrvd2fi 16644 2wlklem 16715 clwwlkext2edg 16761 konigsberglem1 16827 konigsberglem2 16828 konigsberglem3 16829 ex-exp 16839 |
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