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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 11345 | . . . 4 ⊢ +∞ = 𝒫 ∪ ℂ | |
| 2 | pwuninel 8292 | . . . 4 ⊢ ¬ 𝒫 ∪ ℂ ∈ ℂ | |
| 3 | 1, 2 | eqneltri 2879 | . . 3 ⊢ ¬ +∞ ∈ ℂ |
| 4 | recn 11290 | . . 3 ⊢ (+∞ ∈ ℝ → +∞ ∈ ℂ) | |
| 5 | 3, 4 | mto 200 | . 2 ⊢ ¬ +∞ ∈ ℝ |
| 6 | 5 | nelir 3064 | 1 ⊢ +∞ ∉ ℝ |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: ∈ wcel 2144 ∉ wnel 3061 𝒫 cpw 4556 ∪ cuni 4866 ℂcc 11198 ℝcr 11199 +∞cpnf 11340 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1827 ax-4 1841 ax-5 1942 ax-6 1999 ax-7 2040 ax-8 2146 ax-9 2154 ax-ext 2732 ax-sep 5248 ax-resscn 11257 |
| This proof depends on definitions: df-bi 210 df-an 402 df-3an 1105 df-tru 1572 df-ex 1812 df-sb 2099 df-clab 2739 df-cleq 2752 df-clel 2835 df-nel 3062 df-rab 3413 df-v 3452 df-ss 3896 df-in 4091 df-pw 4558 df-uni 4867 df-pnf 11345 |
| This theorem is used by: pnfnre2 11351 renepnf 11357 ltxrlt 11380 nn0nepnf 12687 xrltnr 13248 pnfnlt 13257 xnn0lenn0nn0 13375 hashclb 14502 hasheq0 14507 pcgcd1 17055 pc2dvds 17057 ramtcl2 17189 odhash3 19790 xrsdsreclblem 21719 pnfnei 23538 iccpnfcnv 25265 i1f0rn 26003 |
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