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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 10853 | . 2 ⊢ +∞ ≠ -∞ | |
2 | 1 | necomi 2986 | 1 ⊢ -∞ ≠ +∞ |
Colors of variables: wff setvar class |
Syntax hints: ≠ wne 2932 +∞cpnf 10829 -∞cmnf 10830 |
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 1976 ax-7 2018 ax-8 2114 ax-9 2122 ax-ext 2708 ax-sep 5177 ax-pow 5243 ax-un 7501 ax-cnex 10750 |
This theorem depends on definitions: df-bi 210 df-an 400 df-or 848 df-tru 1546 df-ex 1788 df-sb 2073 df-clab 2715 df-cleq 2728 df-clel 2809 df-ne 2933 df-rab 3060 df-v 3400 df-un 3858 df-in 3860 df-ss 3870 df-pw 4501 df-sn 4528 df-pr 4530 df-uni 4806 df-pnf 10834 df-mnf 10835 df-xr 10836 |
This theorem is referenced by: xrnepnf 12675 xnegmnf 12765 xaddmnf1 12783 xaddmnf2 12784 mnfaddpnf 12786 xaddnepnf 12792 xmullem2 12820 xadddilem 12849 resup 13405 |
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