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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 10684 | . . . 4 ⊢ +∞ ∈ ℝ* | |
2 | pwne 5216 | . . . 4 ⊢ (+∞ ∈ ℝ* → 𝒫 +∞ ≠ +∞) | |
3 | 1, 2 | ax-mp 5 | . . 3 ⊢ 𝒫 +∞ ≠ +∞ |
4 | 3 | necomi 3041 | . 2 ⊢ +∞ ≠ 𝒫 +∞ |
5 | df-mnf 10667 | . 2 ⊢ -∞ = 𝒫 +∞ | |
6 | 4, 5 | neeqtrri 3060 | 1 ⊢ +∞ ≠ -∞ |
Colors of variables: wff setvar class |
Syntax hints: ∈ wcel 2111 ≠ wne 2987 𝒫 cpw 4497 +∞cpnf 10661 -∞cmnf 10662 ℝ*cxr 10663 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1797 ax-4 1811 ax-5 1911 ax-6 1970 ax-7 2015 ax-8 2113 ax-9 2121 ax-10 2142 ax-11 2158 ax-12 2175 ax-ext 2770 ax-sep 5167 ax-pow 5231 ax-un 7441 ax-cnex 10582 |
This theorem depends on definitions: df-bi 210 df-an 400 df-or 845 df-tru 1541 df-ex 1782 df-nf 1786 df-sb 2070 df-clab 2777 df-cleq 2791 df-clel 2870 df-nfc 2938 df-ne 2988 df-rab 3115 df-v 3443 df-un 3886 df-in 3888 df-ss 3898 df-pw 4499 df-sn 4526 df-pr 4528 df-uni 4801 df-pnf 10666 df-mnf 10667 df-xr 10668 |
This theorem is referenced by: mnfnepnf 10686 xnn0nemnf 11966 xrnemnf 12500 xrltnr 12502 pnfnlt 12511 nltmnf 12512 xaddpnf1 12607 xaddnemnf 12617 xmullem2 12646 xadddilem 12675 hashnemnf 13700 xrge0iifhom 31290 esumpr2 31436 |
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