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| Mirrors > Home > ILE Home > Th. List > mnfnepnf | GIF version | ||
| Description: Minus and plus infinity are different (common case). (Contributed by David A. Wheeler, 8-Dec-2018.) |
| Ref | Expression |
|---|---|
| mnfnepnf | ⊢ -∞ ≠ +∞ |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | pnfnemnf 8324 | . 2 ⊢ +∞ ≠ -∞ | |
| 2 | 1 | necomi 2497 | 1 ⊢ -∞ ≠ +∞ |
| Colors of variables: wff set class |
| Syntax hints: ≠ wne 2412 +∞cpnf 8301 -∞cmnf 8302 |
| 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-in1 619 ax-in2 620 ax-io 717 ax-5 1496 ax-7 1497 ax-gen 1498 ax-ie1 1542 ax-ie2 1543 ax-8 1553 ax-10 1554 ax-11 1555 ax-i12 1556 ax-bndl 1558 ax-4 1559 ax-17 1575 ax-i9 1579 ax-ial 1583 ax-i5r 1584 ax-13 2205 ax-14 2206 ax-ext 2214 ax-sep 4227 ax-pow 4286 ax-un 4553 ax-cnex 8214 |
| This theorem depends on definitions: df-bi 117 df-tru 1401 df-fal 1404 df-nf 1510 df-sb 1812 df-clab 2219 df-cleq 2225 df-clel 2228 df-nfc 2373 df-ne 2413 df-nel 2508 df-rex 2526 df-rab 2529 df-v 2814 df-un 3214 df-in 3216 df-ss 3223 df-pw 3670 df-sn 3694 df-pr 3695 df-uni 3914 df-pnf 8306 df-mnf 8307 df-xr 8308 |
| This theorem is referenced by: xrnepnf 10107 xrlttri3 10126 nltpnft 10143 xnegmnf 10158 xrpnfdc 10171 xaddmnf1 10177 xaddmnf2 10178 mnfaddpnf 10180 xaddnepnf 10187 xsubge0 10210 xposdif 10211 xleaddadd 10216 |
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