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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 11302 | . . . 4 ⊢ +∞ = 𝒫 ∪ ℂ | |
| 2 | pwuninel 8271 | . . . 4 ⊢ ¬ 𝒫 ∪ ℂ ∈ ℂ | |
| 3 | 1, 2 | eqneltri 2879 | . . 3 ⊢ ¬ +∞ ∈ ℂ |
| 4 | recn 11247 | . . 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 2145 ∉ wnel 3061 𝒫 cpw 4557 ∪ cuni 4867 ℂcc 11155 ℝcr 11156 +∞cpnf 11297 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1828 ax-4 1842 ax-5 1943 ax-6 2000 ax-7 2041 ax-8 2147 ax-9 2155 ax-ext 2732 ax-sep 5249 ax-resscn 11214 |
| This proof depends on definitions: df-bi 210 df-an 402 df-3an 1105 df-tru 1573 df-ex 1813 df-sb 2100 df-clab 2739 df-cleq 2752 df-clel 2835 df-nel 3062 df-rab 3413 df-v 3452 df-in 3906 df-ss 3916 df-pw 4559 df-uni 4868 df-pnf 11302 |
| This theorem is used by: pnfnre2 11308 renepnf 11314 ltxrlt 11337 nn0nepnf 12642 xrltnr 13203 pnfnlt 13212 xnn0lenn0nn0 13330 hashclb 14455 hasheq0 14460 pcgcd1 17002 pc2dvds 17004 ramtcl2 17136 odhash3 19737 xrsdsreclblem 21666 pnfnei 23485 iccpnfcnv 25212 i1f0rn 25950 |
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