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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 10697 | . . . 4 ⊢ +∞ ∈ ℝ* | |
2 | pwne 5253 | . . . 4 ⊢ (+∞ ∈ ℝ* → 𝒫 +∞ ≠ +∞) | |
3 | 1, 2 | ax-mp 5 | . . 3 ⊢ 𝒫 +∞ ≠ +∞ |
4 | 3 | necomi 3072 | . 2 ⊢ +∞ ≠ 𝒫 +∞ |
5 | df-mnf 10680 | . 2 ⊢ -∞ = 𝒫 +∞ | |
6 | 4, 5 | neeqtrri 3091 | 1 ⊢ +∞ ≠ -∞ |
Colors of variables: wff setvar class |
Syntax hints: ∈ wcel 2114 ≠ wne 3018 𝒫 cpw 4541 +∞cpnf 10674 -∞cmnf 10675 ℝ*cxr 10676 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1796 ax-4 1810 ax-5 1911 ax-6 1970 ax-7 2015 ax-8 2116 ax-9 2124 ax-10 2145 ax-11 2161 ax-12 2177 ax-ext 2795 ax-sep 5205 ax-pow 5268 ax-un 7463 ax-cnex 10595 |
This theorem depends on definitions: df-bi 209 df-an 399 df-or 844 df-tru 1540 df-ex 1781 df-nf 1785 df-sb 2070 df-clab 2802 df-cleq 2816 df-clel 2895 df-nfc 2965 df-ne 3019 df-rab 3149 df-v 3498 df-un 3943 df-in 3945 df-ss 3954 df-pw 4543 df-sn 4570 df-pr 4572 df-uni 4841 df-pnf 10679 df-mnf 10680 df-xr 10681 |
This theorem is referenced by: mnfnepnf 10699 xnn0nemnf 11981 xrnemnf 12515 xrltnr 12517 pnfnlt 12526 nltmnf 12527 xaddpnf1 12622 xaddnemnf 12632 xmullem2 12661 xadddilem 12690 hashnemnf 13707 xrge0iifhom 31182 esumpr2 31328 |
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