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| Mirrors > Home > MPE Home > Th. List > mnfnepnf | Structured version Visualization version GIF version | ||
| Description: Minus and plus infinity are different. (Contributed by David A. Wheeler, 8-Dec-2018.) |
| Ref | Expression |
|---|---|
| mnfnepnf | ⊢ -∞ ≠ +∞ |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | pnfnemnf 11195 | . 2 ⊢ +∞ ≠ -∞ | |
| 2 | 1 | necomi 2990 | 1 ⊢ -∞ ≠ +∞ |
| Colors of variables: wff setvar class |
| Syntax hints: ≠ wne 2936 +∞cpnf 11171 -∞cmnf 11172 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1803 ax-4 1817 ax-5 1918 ax-6 1975 ax-7 2016 ax-8 2123 ax-9 2131 ax-ext 2713 ax-sep 5221 ax-pow 5297 ax-un 7682 ax-cnex 11089 |
| This theorem depends on definitions: df-bi 209 df-an 398 df-or 855 df-3an 1095 df-tru 1551 df-ex 1788 df-sb 2075 df-clab 2720 df-cleq 2733 df-clel 2816 df-ne 2937 df-rab 3394 df-v 3435 df-un 3890 df-in 3892 df-ss 3902 df-pw 4534 df-sn 4559 df-pr 4561 df-uni 4842 df-pnf 11176 df-mnf 11177 df-xr 11178 |
| This theorem is referenced by: xrnepnf 13064 xnegmnf 13157 xaddmnf1 13175 xaddmnf2 13176 mnfaddpnf 13178 xaddnepnf 13184 xmullem2 13212 xadddilem 13241 resup 13821 |
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