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Mirrors > Home > MPE Home > Th. List > mnfnre | Structured version Visualization version GIF version |
Description: Minus infinity is not a real number. (Contributed by NM, 13-Oct-2005.) |
Ref | Expression |
---|---|
mnfnre | ⊢ -∞ ∉ ℝ |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | df-mnf 10672 | . . . . 5 ⊢ -∞ = 𝒫 +∞ | |
2 | df-pnf 10671 | . . . . . 6 ⊢ +∞ = 𝒫 ∪ ℂ | |
3 | 2 | pweqi 4543 | . . . . 5 ⊢ 𝒫 +∞ = 𝒫 𝒫 ∪ ℂ |
4 | 1, 3 | eqtri 2844 | . . . 4 ⊢ -∞ = 𝒫 𝒫 ∪ ℂ |
5 | 2pwuninel 8666 | . . . 4 ⊢ ¬ 𝒫 𝒫 ∪ ℂ ∈ ℂ | |
6 | 4, 5 | eqneltri 2906 | . . 3 ⊢ ¬ -∞ ∈ ℂ |
7 | recn 10621 | . . 3 ⊢ (-∞ ∈ ℝ → -∞ ∈ ℂ) | |
8 | 6, 7 | mto 199 | . 2 ⊢ ¬ -∞ ∈ ℝ |
9 | 8 | nelir 3126 | 1 ⊢ -∞ ∉ ℝ |
Colors of variables: wff setvar class |
Syntax hints: ∈ wcel 2110 ∉ wnel 3123 𝒫 cpw 4539 ∪ cuni 4832 ℂcc 10529 ℝcr 10530 +∞cpnf 10666 -∞cmnf 10667 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1792 ax-4 1806 ax-5 1907 ax-6 1966 ax-7 2011 ax-8 2112 ax-9 2120 ax-10 2141 ax-11 2156 ax-12 2172 ax-ext 2793 ax-sep 5196 ax-nul 5203 ax-pow 5259 ax-pr 5322 ax-un 7455 ax-resscn 10588 |
This theorem depends on definitions: df-bi 209 df-an 399 df-or 844 df-3an 1085 df-tru 1536 df-ex 1777 df-nf 1781 df-sb 2066 df-mo 2618 df-eu 2650 df-clab 2800 df-cleq 2814 df-clel 2893 df-nfc 2963 df-ne 3017 df-nel 3124 df-ral 3143 df-rex 3144 df-rab 3147 df-v 3497 df-sbc 3773 df-csb 3884 df-dif 3939 df-un 3941 df-in 3943 df-ss 3952 df-nul 4292 df-if 4468 df-pw 4541 df-sn 4562 df-pr 4564 df-op 4568 df-uni 4833 df-br 5060 df-opab 5122 df-mpt 5140 df-id 5455 df-xp 5556 df-rel 5557 df-cnv 5558 df-co 5559 df-dm 5560 df-rn 5561 df-res 5562 df-ima 5563 df-iota 6309 df-fun 6352 df-fn 6353 df-f 6354 df-f1 6355 df-fo 6356 df-f1o 6357 df-fv 6358 df-er 8283 df-en 8504 df-dom 8505 df-sdom 8506 df-pnf 10671 df-mnf 10672 |
This theorem is referenced by: renemnf 10684 ltxrlt 10705 xrltnr 12508 nltmnf 12518 hashnemnf 13698 mnfnei 21823 deg1nn0clb 24678 mnfnre2 41660 |
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