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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 8333 | . 2 ⊢ +∞ ≠ -∞ | |
| 2 | 1 | necomi 2499 | 1 ⊢ -∞ ≠ +∞ |
| Colors of variables: wff set class |
| Syntax hints: ≠ wne 2414 +∞cpnf 8310 -∞cmnf 8311 |
| 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 2207 ax-14 2208 ax-ext 2216 ax-sep 4230 ax-pow 4289 ax-un 4556 ax-cnex 8223 |
| This theorem depends on definitions: df-bi 117 df-tru 1401 df-fal 1404 df-nf 1510 df-sb 1812 df-clab 2221 df-cleq 2227 df-clel 2230 df-nfc 2375 df-ne 2415 df-nel 2510 df-rex 2528 df-rab 2531 df-v 2817 df-un 3217 df-in 3219 df-ss 3226 df-pw 3673 df-sn 3697 df-pr 3698 df-uni 3917 df-pnf 8315 df-mnf 8316 df-xr 8317 |
| This theorem is referenced by: xrnepnf 10117 xrlttri3 10136 nltpnft 10153 xnegmnf 10168 xrpnfdc 10181 xaddmnf1 10187 xaddmnf2 10188 mnfaddpnf 10190 xaddnepnf 10197 xsubge0 10220 xposdif 10221 xleaddadd 10226 |
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