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Mirrors > Home > MPE Home > Th. List > renepnf | Structured version Visualization version GIF version |
Description: No (finite) real equals plus infinity. (Contributed by NM, 14-Oct-2005.) (Proof shortened by Andrew Salmon, 19-Nov-2011.) |
Ref | Expression |
---|---|
renepnf | ⊢ (𝐴 ∈ ℝ → 𝐴 ≠ +∞) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | pnfnre 10671 | . . . 4 ⊢ +∞ ∉ ℝ | |
2 | 1 | neli 3093 | . . 3 ⊢ ¬ +∞ ∈ ℝ |
3 | eleq1 2877 | . . 3 ⊢ (𝐴 = +∞ → (𝐴 ∈ ℝ ↔ +∞ ∈ ℝ)) | |
4 | 2, 3 | mtbiri 330 | . 2 ⊢ (𝐴 = +∞ → ¬ 𝐴 ∈ ℝ) |
5 | 4 | necon2ai 3016 | 1 ⊢ (𝐴 ∈ ℝ → 𝐴 ≠ +∞) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 = wceq 1538 ∈ wcel 2111 ≠ wne 2987 ℝcr 10525 +∞cpnf 10661 |
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-nul 5174 ax-pr 5295 ax-un 7441 ax-resscn 10583 |
This theorem depends on definitions: df-bi 210 df-an 400 df-or 845 df-3an 1086 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-nel 3092 df-rab 3115 df-v 3443 df-dif 3884 df-un 3886 df-in 3888 df-ss 3898 df-nul 4244 df-pw 4499 df-sn 4526 df-pr 4528 df-uni 4801 df-pnf 10666 |
This theorem is referenced by: renepnfd 10681 renfdisj 10690 xrnepnf 12501 rexneg 12592 rexadd 12613 xaddnepnf 12618 xaddcom 12621 xaddid1 12622 xnn0xadd0 12628 xnegdi 12629 xpncan 12632 xleadd1a 12634 rexmul 12652 xmulpnf1 12655 xadddilem 12675 rpsup 13229 hashneq0 13721 hash1snb 13776 xrsnsgrp 20127 xaddeq0 30503 icorempo 34768 ovoliunnfl 35099 voliunnfl 35101 volsupnfl 35102 supxrgelem 41969 supxrge 41970 infleinflem1 42002 infleinflem2 42003 xrre4 42048 supminfxr2 42108 climxrre 42392 sge0repnf 43025 voliunsge0lem 43111 |
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