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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 11272 | . . . 4 ⊢ +∞ = 𝒫 ∪ ℂ | |
| 2 | pwuninel 8276 | . . . 4 ⊢ ¬ 𝒫 ∪ ℂ ∈ ℂ | |
| 3 | 1, 2 | eqneltri 2881 | . . 3 ⊢ ¬ +∞ ∈ ℂ |
| 4 | recn 11217 | . . 3 ⊢ (+∞ ∈ ℝ → +∞ ∈ ℂ) | |
| 5 | 3, 4 | mto 200 | . 2 ⊢ ¬ +∞ ∈ ℝ |
| 6 | 5 | nelir 3066 | 1 ⊢ +∞ ∉ ℝ |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: ∈ wcel 2145 ∉ wnel 3063 𝒫 cpw 4560 ∪ cuni 4870 ℂcc 11125 ℝcr 11126 +∞cpnf 11267 |
| 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 2734 ax-sep 5255 ax-resscn 11184 |
| 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 2741 df-cleq 2754 df-clel 2837 df-nel 3064 df-rab 3415 df-v 3455 df-in 3909 df-ss 3919 df-pw 4562 df-uni 4871 df-pnf 11272 |
| This theorem is used by: pnfnre2 11278 renepnf 11284 ltxrlt 11307 nn0nepnf 12612 xrltnr 13172 pnfnlt 13181 xnn0lenn0nn0 13299 hashclb 14424 hasheq0 14429 pcgcd1 16973 pc2dvds 16975 ramtcl2 17107 odhash3 19704 xrsdsreclblem 21627 pnfnei 23446 iccpnfcnv 25173 i1f0rn 25911 |
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