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| Mirrors > Home > MPE Home > Th. List > pnfnre | Structured version Visualization version GIF version | ||
| Description: Plus infinity is not a real number. (Contributed by NM, 13-Oct-2005.) |
| Ref | Expression |
|---|---|
| pnfnre | ⊢ +∞ ∉ ℝ |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | df-pnf 11176 | . . . 4 ⊢ +∞ = 𝒫 ∪ ℂ | |
| 2 | pwuninel 8219 | . . . 4 ⊢ ¬ 𝒫 ∪ ℂ ∈ ℂ | |
| 3 | 1, 2 | eqneltri 2860 | . . 3 ⊢ ¬ +∞ ∈ ℂ |
| 4 | recn 11123 | . . 3 ⊢ (+∞ ∈ ℝ → +∞ ∈ ℂ) | |
| 5 | 3, 4 | mto 199 | . 2 ⊢ ¬ +∞ ∈ ℝ |
| 6 | 5 | nelir 3043 | 1 ⊢ +∞ ∉ ℝ |
| Colors of variables: wff setvar class |
| Syntax hints: ∈ wcel 2121 ∉ wnel 3040 𝒫 cpw 4532 ∪ cuni 4841 ℂcc 11031 ℝcr 11032 +∞cpnf 11171 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1803 ax-4 1817 ax-5 1918 ax-6 1975 ax-7 2016 ax-8 2123 ax-9 2131 ax-ext 2713 ax-sep 5221 ax-pr 5365 ax-un 7682 ax-resscn 11090 |
| This theorem depends on definitions: df-bi 209 df-an 398 df-or 855 df-3an 1095 df-tru 1551 df-ex 1788 df-sb 2075 df-clab 2720 df-cleq 2733 df-clel 2816 df-nel 3041 df-rab 3394 df-v 3435 df-un 3890 df-in 3892 df-ss 3902 df-pw 4534 df-sn 4559 df-pr 4561 df-uni 4842 df-pnf 11176 |
| This theorem is referenced by: pnfnre2 11182 renepnf 11188 ltxrlt 11211 nn0nepnf 12513 xrltnr 13065 pnfnlt 13074 xnn0lenn0nn0 13192 hashclb 14315 hasheq0 14320 pcgcd1 16843 pc2dvds 16845 ramtcl2 16977 odhash3 19546 xrsdsreclblem 21392 pnfnei 23207 iccpnfcnv 24933 i1f0rn 25671 |
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