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Mirrors > Home > ILE Home > Th. List > psmetxrge0 | Unicode version |
Description: The distance function of a pseudometric space is a function into the nonnegative extended real numbers. (Contributed by Thierry Arnoux, 24-Feb-2018.) |
Ref | Expression |
---|---|
psmetxrge0 | PsMet |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | psmetf 12421 | . . 3 PsMet | |
2 | 1 | ffnd 5243 | . 2 PsMet |
3 | 1 | ffvelrnda 5523 | . . . . 5 PsMet |
4 | elxp6 6035 | . . . . . . . 8 | |
5 | 4 | simprbi 273 | . . . . . . 7 |
6 | psmetge0 12427 | . . . . . . . 8 PsMet | |
7 | 6 | 3expb 1167 | . . . . . . 7 PsMet |
8 | 5, 7 | sylan2 284 | . . . . . 6 PsMet |
9 | 1st2nd2 6041 | . . . . . . . . 9 | |
10 | 9 | fveq2d 5393 | . . . . . . . 8 |
11 | df-ov 5745 | . . . . . . . 8 | |
12 | 10, 11 | syl6eqr 2168 | . . . . . . 7 |
13 | 12 | adantl 275 | . . . . . 6 PsMet |
14 | 8, 13 | breqtrrd 3926 | . . . . 5 PsMet |
15 | elxrge0 9729 | . . . . 5 | |
16 | 3, 14, 15 | sylanbrc 413 | . . . 4 PsMet |
17 | 16 | ralrimiva 2482 | . . 3 PsMet |
18 | fnfvrnss 5548 | . . 3 | |
19 | 2, 17, 18 | syl2anc 408 | . 2 PsMet |
20 | df-f 5097 | . 2 | |
21 | 2, 19, 20 | sylanbrc 413 | 1 PsMet |
Colors of variables: wff set class |
Syntax hints: wi 4 wa 103 wceq 1316 wcel 1465 wral 2393 wss 3041 cop 3500 class class class wbr 3899 cxp 4507 crn 4510 wfn 5088 wf 5089 cfv 5093 (class class class)co 5742 c1st 6004 c2nd 6005 cc0 7588 cpnf 7765 cxr 7767 cle 7769 cicc 9642 PsMetcpsmet 12075 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 105 ax-ia2 106 ax-ia3 107 ax-in1 588 ax-in2 589 ax-io 683 ax-5 1408 ax-7 1409 ax-gen 1410 ax-ie1 1454 ax-ie2 1455 ax-8 1467 ax-10 1468 ax-11 1469 ax-i12 1470 ax-bndl 1471 ax-4 1472 ax-13 1476 ax-14 1477 ax-17 1491 ax-i9 1495 ax-ial 1499 ax-i5r 1500 ax-ext 2099 ax-sep 4016 ax-pow 4068 ax-pr 4101 ax-un 4325 ax-setind 4422 ax-cnex 7679 ax-resscn 7680 ax-1cn 7681 ax-1re 7682 ax-icn 7683 ax-addcl 7684 ax-addrcl 7685 ax-mulcl 7686 ax-mulrcl 7687 ax-addcom 7688 ax-mulcom 7689 ax-addass 7690 ax-mulass 7691 ax-distr 7692 ax-i2m1 7693 ax-0lt1 7694 ax-1rid 7695 ax-0id 7696 ax-rnegex 7697 ax-precex 7698 ax-cnre 7699 ax-pre-ltirr 7700 ax-pre-lttrn 7702 ax-pre-ltadd 7704 ax-pre-mulgt0 7705 |
This theorem depends on definitions: df-bi 116 df-dc 805 df-3or 948 df-3an 949 df-tru 1319 df-fal 1322 df-nf 1422 df-sb 1721 df-eu 1980 df-mo 1981 df-clab 2104 df-cleq 2110 df-clel 2113 df-nfc 2247 df-ne 2286 df-nel 2381 df-ral 2398 df-rex 2399 df-reu 2400 df-rab 2402 df-v 2662 df-sbc 2883 df-csb 2976 df-dif 3043 df-un 3045 df-in 3047 df-ss 3054 df-if 3445 df-pw 3482 df-sn 3503 df-pr 3504 df-op 3506 df-uni 3707 df-iun 3785 df-br 3900 df-opab 3960 df-mpt 3961 df-id 4185 df-xp 4515 df-rel 4516 df-cnv 4517 df-co 4518 df-dm 4519 df-rn 4520 df-res 4521 df-ima 4522 df-iota 5058 df-fun 5095 df-fn 5096 df-f 5097 df-fv 5101 df-riota 5698 df-ov 5745 df-oprab 5746 df-mpo 5747 df-1st 6006 df-2nd 6007 df-map 6512 df-pnf 7770 df-mnf 7771 df-xr 7772 df-ltxr 7773 df-le 7774 df-sub 7903 df-neg 7904 df-2 8747 df-xadd 9528 df-icc 9646 df-psmet 12083 |
This theorem is referenced by: (None) |
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