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| Mirrors > Home > ILE Home > Th. List > cnegex2 | Unicode version | ||
| Description: Existence of a left inverse for addition. (Contributed by Scott Fenton, 3-Jan-2013.) |
| Ref | Expression |
|---|---|
| cnegex2 |
|
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | cnegex 8356 |
. 2
| |
| 2 | addcom 8315 |
. . . 4
| |
| 3 | 2 | eqeq1d 2240 |
. . 3
|
| 4 | 3 | rexbidva 2529 |
. 2
|
| 5 | 1, 4 | mpbid 147 |
1
|
| Colors of variables: wff set class |
| Syntax hints: |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 106 ax-ia2 107 ax-ia3 108 ax-io 716 ax-5 1495 ax-7 1496 ax-gen 1497 ax-ie1 1541 ax-ie2 1542 ax-8 1552 ax-10 1553 ax-11 1554 ax-i12 1555 ax-bndl 1557 ax-4 1558 ax-17 1574 ax-i9 1578 ax-ial 1582 ax-i5r 1583 ax-ext 2213 ax-resscn 8123 ax-1cn 8124 ax-icn 8126 ax-addcl 8127 ax-addrcl 8128 ax-mulcl 8129 ax-addcom 8131 ax-addass 8133 ax-distr 8135 ax-i2m1 8136 ax-0id 8139 ax-rnegex 8140 ax-cnre 8142 |
| This theorem depends on definitions: df-bi 117 df-3an 1006 df-tru 1400 df-nf 1509 df-sb 1811 df-clab 2218 df-cleq 2224 df-clel 2227 df-nfc 2363 df-ral 2515 df-rex 2516 df-v 2804 df-un 3204 df-in 3206 df-ss 3213 df-sn 3675 df-pr 3676 df-op 3678 df-uni 3894 df-br 4089 df-iota 5286 df-fv 5334 df-ov 6020 |
| This theorem is referenced by: addcan 8358 |
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