Metamath Proof Explorer |
< Previous
Next >
Nearby theorems |
||
Mirrors > Home > MPE Home > Th. List > supxrpnf | Structured version Visualization version GIF version |
Description: The supremum of a set of extended reals containing plus infinity is plus infinity. (Contributed by NM, 15-Oct-2005.) |
Ref | Expression |
---|---|
supxrpnf | ⊢ ((𝐴 ⊆ ℝ* ∧ +∞ ∈ 𝐴) → sup(𝐴, ℝ*, < ) = +∞) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | ssel 3961 | . . . . 5 ⊢ (𝐴 ⊆ ℝ* → (𝑦 ∈ 𝐴 → 𝑦 ∈ ℝ*)) | |
2 | pnfnlt 12524 | . . . . 5 ⊢ (𝑦 ∈ ℝ* → ¬ +∞ < 𝑦) | |
3 | 1, 2 | syl6 35 | . . . 4 ⊢ (𝐴 ⊆ ℝ* → (𝑦 ∈ 𝐴 → ¬ +∞ < 𝑦)) |
4 | 3 | ralrimiv 3181 | . . 3 ⊢ (𝐴 ⊆ ℝ* → ∀𝑦 ∈ 𝐴 ¬ +∞ < 𝑦) |
5 | breq2 5070 | . . . . . 6 ⊢ (𝑧 = +∞ → (𝑦 < 𝑧 ↔ 𝑦 < +∞)) | |
6 | 5 | rspcev 3623 | . . . . 5 ⊢ ((+∞ ∈ 𝐴 ∧ 𝑦 < +∞) → ∃𝑧 ∈ 𝐴 𝑦 < 𝑧) |
7 | 6 | ex 415 | . . . 4 ⊢ (+∞ ∈ 𝐴 → (𝑦 < +∞ → ∃𝑧 ∈ 𝐴 𝑦 < 𝑧)) |
8 | 7 | ralrimivw 3183 | . . 3 ⊢ (+∞ ∈ 𝐴 → ∀𝑦 ∈ ℝ (𝑦 < +∞ → ∃𝑧 ∈ 𝐴 𝑦 < 𝑧)) |
9 | 4, 8 | anim12i 614 | . 2 ⊢ ((𝐴 ⊆ ℝ* ∧ +∞ ∈ 𝐴) → (∀𝑦 ∈ 𝐴 ¬ +∞ < 𝑦 ∧ ∀𝑦 ∈ ℝ (𝑦 < +∞ → ∃𝑧 ∈ 𝐴 𝑦 < 𝑧))) |
10 | pnfxr 10695 | . . 3 ⊢ +∞ ∈ ℝ* | |
11 | supxr 12707 | . . 3 ⊢ (((𝐴 ⊆ ℝ* ∧ +∞ ∈ ℝ*) ∧ (∀𝑦 ∈ 𝐴 ¬ +∞ < 𝑦 ∧ ∀𝑦 ∈ ℝ (𝑦 < +∞ → ∃𝑧 ∈ 𝐴 𝑦 < 𝑧))) → sup(𝐴, ℝ*, < ) = +∞) | |
12 | 10, 11 | mpanl2 699 | . 2 ⊢ ((𝐴 ⊆ ℝ* ∧ (∀𝑦 ∈ 𝐴 ¬ +∞ < 𝑦 ∧ ∀𝑦 ∈ ℝ (𝑦 < +∞ → ∃𝑧 ∈ 𝐴 𝑦 < 𝑧))) → sup(𝐴, ℝ*, < ) = +∞) |
13 | 9, 12 | syldan 593 | 1 ⊢ ((𝐴 ⊆ ℝ* ∧ +∞ ∈ 𝐴) → sup(𝐴, ℝ*, < ) = +∞) |
Colors of variables: wff setvar class |
Syntax hints: ¬ wn 3 → wi 4 ∧ wa 398 = wceq 1537 ∈ wcel 2114 ∀wral 3138 ∃wrex 3139 ⊆ wss 3936 class class class wbr 5066 supcsup 8904 ℝcr 10536 +∞cpnf 10672 ℝ*cxr 10674 < clt 10675 |
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-cnex 10593 ax-resscn 10594 ax-1cn 10595 ax-icn 10596 ax-addcl 10597 ax-addrcl 10598 ax-mulcl 10599 ax-mulrcl 10600 ax-mulcom 10601 ax-addass 10602 ax-mulass 10603 ax-distr 10604 ax-i2m1 10605 ax-1ne0 10606 ax-1rid 10607 ax-rnegex 10608 ax-rrecex 10609 ax-cnre 10610 ax-pre-lttri 10611 ax-pre-lttrn 10612 ax-pre-ltadd 10613 ax-pre-mulgt0 10614 |
This theorem depends on definitions: df-bi 209 df-an 399 df-or 844 df-3or 1084 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-reu 3145 df-rmo 3146 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-po 5474 df-so 5475 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-riota 7114 df-ov 7159 df-oprab 7160 df-mpo 7161 df-er 8289 df-en 8510 df-dom 8511 df-sdom 8512 df-sup 8906 df-pnf 10677 df-mnf 10678 df-xr 10679 df-ltxr 10680 df-le 10681 df-sub 10872 df-neg 10873 |
This theorem is referenced by: xrsup 13237 volsup 24157 supxrge 41626 supminfxr2 41765 sge0tsms 42682 sge0sup 42693 |
Copyright terms: Public domain | W3C validator |