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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 10678 | . . . . 5 ⊢ -∞ = 𝒫 +∞ | |
2 | df-pnf 10677 | . . . . . 6 ⊢ +∞ = 𝒫 ∪ ℂ | |
3 | 2 | pweqi 4557 | . . . . 5 ⊢ 𝒫 +∞ = 𝒫 𝒫 ∪ ℂ |
4 | 1, 3 | eqtri 2844 | . . . 4 ⊢ -∞ = 𝒫 𝒫 ∪ ℂ |
5 | 2pwuninel 8672 | . . . 4 ⊢ ¬ 𝒫 𝒫 ∪ ℂ ∈ ℂ | |
6 | 4, 5 | eqneltri 2906 | . . 3 ⊢ ¬ -∞ ∈ ℂ |
7 | recn 10627 | . . 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 2114 ∉ wnel 3123 𝒫 cpw 4539 ∪ cuni 4838 ℂcc 10535 ℝcr 10536 +∞cpnf 10672 -∞cmnf 10673 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1796 ax-4 1810 ax-5 1911 ax-6 1970 ax-7 2015 ax-8 2116 ax-9 2124 ax-10 2145 ax-11 2161 ax-12 2177 ax-ext 2793 ax-sep 5203 ax-nul 5210 ax-pow 5266 ax-pr 5330 ax-un 7461 ax-resscn 10594 |
This theorem depends on definitions: df-bi 209 df-an 399 df-or 844 df-3an 1085 df-tru 1540 df-ex 1781 df-nf 1785 df-sb 2070 df-mo 2622 df-eu 2654 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 3496 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 4568 df-pr 4570 df-op 4574 df-uni 4839 df-br 5067 df-opab 5129 df-mpt 5147 df-id 5460 df-xp 5561 df-rel 5562 df-cnv 5563 df-co 5564 df-dm 5565 df-rn 5566 df-res 5567 df-ima 5568 df-iota 6314 df-fun 6357 df-fn 6358 df-f 6359 df-f1 6360 df-fo 6361 df-f1o 6362 df-fv 6363 df-er 8289 df-en 8510 df-dom 8511 df-sdom 8512 df-pnf 10677 df-mnf 10678 |
This theorem is referenced by: renemnf 10690 ltxrlt 10711 xrltnr 12515 nltmnf 12525 hashnemnf 13705 mnfnei 21829 deg1nn0clb 24684 mnfnre2 41688 |
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