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Mirrors > Home > MPE Home > Th. List > mnfnepnf | Structured version Visualization version 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 9973 | . 2 ⊢ +∞ ≠ -∞ | |
2 | 1 | necomi 2836 | 1 ⊢ -∞ ≠ +∞ |
Colors of variables: wff setvar class |
Syntax hints: ≠ wne 2780 +∞cpnf 9950 -∞cmnf 9951 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1713 ax-4 1728 ax-5 1827 ax-6 1875 ax-7 1922 ax-8 1979 ax-9 1986 ax-10 2006 ax-11 2021 ax-12 2034 ax-13 2234 ax-ext 2590 ax-sep 4709 ax-pow 4769 ax-un 6847 ax-cnex 9871 |
This theorem depends on definitions: df-bi 196 df-or 384 df-an 385 df-tru 1478 df-ex 1696 df-nf 1701 df-sb 1868 df-clab 2597 df-cleq 2603 df-clel 2606 df-nfc 2740 df-ne 2782 df-nel 2783 df-rex 2902 df-rab 2905 df-v 3175 df-un 3545 df-in 3547 df-ss 3554 df-pw 4110 df-sn 4126 df-pr 4128 df-uni 4373 df-pnf 9955 df-mnf 9956 df-xr 9957 |
This theorem is referenced by: xrnepnf 11828 xnegmnf 11915 xaddmnf1 11933 xaddmnf2 11934 mnfaddpnf 11936 xaddnepnf 11942 xmullem2 11967 xadddilem 11996 resup 12528 |
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