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Related theorems GIF version |
| Description: Plus and minus infinity are distinguished elements of ℝ*. |
| Ref | Expression |
|---|---|
| pnfnemnf | ⊢ +∞ ≠ -∞ |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | sdomirr 4452 | . . 3 ⊢ ¬ +∞ ≺ +∞ | |
| 2 | df-mnf 5460 | . . . . 5 ⊢ -∞ = ℘ +∞ | |
| 3 | 2 | eqeq2i 1477 | . . . 4 ⊢ ( +∞ = -∞ ↔ +∞ = ℘ +∞) |
| 4 | df-pnf 5459 | . . . . . . 7 ⊢ +∞ = ℘∪ℂ | |
| 5 | axcnex 5239 | . . . . . . . . 9 ⊢ ℂ ∈ V | |
| 6 | 5 | uniex 2861 | . . . . . . . 8 ⊢ ∪ℂ ∈ V |
| 7 | 6 | pwex 2735 | . . . . . . 7 ⊢ ℘∪ℂ ∈ V |
| 8 | 4, 7 | eqeltr 1536 | . . . . . 6 ⊢ +∞ ∈ V |
| 9 | 8 | canth2 4464 | . . . . 5 ⊢ +∞ ≺ ℘ +∞ |
| 10 | breq2 2613 | . . . . 5 ⊢ ( +∞ = ℘ +∞ → ( +∞ ≺ +∞ ↔ +∞ ≺ ℘ +∞)) | |
| 11 | 9, 10 | mpbiri 194 | . . . 4 ⊢ ( +∞ = ℘ +∞ → +∞ ≺ +∞) |
| 12 | 3, 11 | sylbi 199 | . . 3 ⊢ ( +∞ = -∞ → +∞ ≺ +∞) |
| 13 | 1, 12 | mto 106 | . 2 ⊢ ¬ +∞ = -∞ |
| 14 | df-ne 1579 | . 2 ⊢ ( +∞ ≠ -∞ ↔ ¬ +∞ = -∞) | |
| 15 | 13, 14 | mpbir 190 | 1 ⊢ +∞ ≠ -∞ |
| Colors of variables: wff set class |
| Syntax hints: ¬ wn 2 = wceq 953 ≠ wne 1577 Vcvv 1802 ℘cpw 2391 ∪cuni 2493 class class class wbr 2609 ≺ csdm 4350 ℂcc 5204 +∞cpnf 5455 -∞cmnf 5456 |
| This theorem is referenced by: xrltnrt 5514 pnfnltt 5519 nltmnft 5520 |
| This theorem was proved from axioms: ax-1 4 ax-2 5 ax-3 6 ax-mp 7 ax-7 959 ax-gen 960 ax-8 961 ax-9 962 ax-10 963 ax-11 964 ax-12 965 ax-13 966 ax-14 967 ax-17 968 ax-4 970 ax-5o 972 ax-6o 975 ax-9o 1119 ax-10o 1136 ax-16 1206 ax-11o 1213 ax-ext 1452 ax-rep 2683 ax-sep 2693 ax-nul 2700 ax-pow 2732 ax-pr 2769 ax-un 2857 ax-inf2 4597 |
| This theorem depends on definitions: df-bi 147 df-or 224 df-an 225 df-3or 774 df-3an 775 df-ex 978 df-sb 1168 df-eu 1375 df-mo 1376 df-clab 1457 df-cleq 1462 df-clel 1465 df-ne 1579 df-ral 1641 df-rex 1642 df-rab 1644 df-v 1803 df-dif 2039 df-un 2040 df-in 2041 df-ss 2043 df-pss 2045 df-nul 2271 df-if 2352 df-pw 2392 df-sn 2402 df-pr 2403 df-tp 2405 df-op 2406 df-uni 2494 df-br 2610 df-opab 2657 df-tr 2671 df-eprel 2821 df-id 2824 df-po 2831 df-so 2841 df-fr 2907 df-we 2924 df-ord 2941 df-on 2942 df-lim 2943 df-suc 2944 df-om 3122 df-xp 3174 df-rel 3175 df-cnv 3176 df-co 3177 df-dm 3178 df-rn 3179 df-res 3180 df-ima 3181 df-fun 3182 df-fn 3183 df-f 3184 df-f1 3185 df-fo 3186 df-f1o 3187 df-fv 3188 df-qs 4250 df-en 4351 df-dom 4352 df-sdom 4353 df-ni 4972 df-nq 5010 df-np 5058 df-nr 5139 df-c 5212 df-pnf 5459 df-mnf 5460 |