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Mirrors > Home > MPE Home > Th. List > pnfnemnf | Structured version Visualization version GIF version |
Description: Plus and minus infinity are different elements of ℝ*. (Contributed by NM, 14-Oct-2005.) |
Ref | Expression |
---|---|
pnfnemnf | ⊢ +∞ ≠ -∞ |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | pnfxr 10698 | . . . 4 ⊢ +∞ ∈ ℝ* | |
2 | pwne 5254 | . . . 4 ⊢ (+∞ ∈ ℝ* → 𝒫 +∞ ≠ +∞) | |
3 | 1, 2 | ax-mp 5 | . . 3 ⊢ 𝒫 +∞ ≠ +∞ |
4 | 3 | necomi 3073 | . 2 ⊢ +∞ ≠ 𝒫 +∞ |
5 | df-mnf 10681 | . 2 ⊢ -∞ = 𝒫 +∞ | |
6 | 4, 5 | neeqtrri 3092 | 1 ⊢ +∞ ≠ -∞ |
Colors of variables: wff setvar class |
Syntax hints: ∈ wcel 2113 ≠ wne 3019 𝒫 cpw 4542 +∞cpnf 10675 -∞cmnf 10676 ℝ*cxr 10677 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1795 ax-4 1809 ax-5 1910 ax-6 1969 ax-7 2014 ax-8 2115 ax-9 2123 ax-10 2144 ax-11 2160 ax-12 2176 ax-ext 2796 ax-sep 5206 ax-pow 5269 ax-un 7464 ax-cnex 10596 |
This theorem depends on definitions: df-bi 209 df-an 399 df-or 844 df-tru 1539 df-ex 1780 df-nf 1784 df-sb 2069 df-clab 2803 df-cleq 2817 df-clel 2896 df-nfc 2966 df-ne 3020 df-rab 3150 df-v 3499 df-un 3944 df-in 3946 df-ss 3955 df-pw 4544 df-sn 4571 df-pr 4573 df-uni 4842 df-pnf 10680 df-mnf 10681 df-xr 10682 |
This theorem is referenced by: mnfnepnf 10700 xnn0nemnf 11981 xrnemnf 12515 xrltnr 12517 pnfnlt 12526 nltmnf 12527 xaddpnf1 12622 xaddnemnf 12632 xmullem2 12661 xadddilem 12690 hashnemnf 13707 xrge0iifhom 31184 esumpr2 31330 |
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