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Theorem mopni3 13278
Description: An open set of a metric space includes an arbitrarily small ball around each of its points. (Contributed by NM, 20-Sep-2007.) (Revised by Mario Carneiro, 12-Nov-2013.)
Hypothesis
Ref Expression
mopni.1  |-  J  =  ( MetOpen `  D )
Assertion
Ref Expression
mopni3  |-  ( ( ( D  e.  ( *Met `  X
)  /\  A  e.  J  /\  P  e.  A
)  /\  R  e.  RR+ )  ->  E. x  e.  RR+  ( x  < 
R  /\  ( P
( ball `  D )
x )  C_  A
) )
Distinct variable groups:    x, A    x, D    x, J    x, R    x, P    x, X

Proof of Theorem mopni3
Dummy variable  y is distinct from all other variables.
StepHypRef Expression
1 mopni.1 . . . 4  |-  J  =  ( MetOpen `  D )
21mopni2 13277 . . 3  |-  ( ( D  e.  ( *Met `  X )  /\  A  e.  J  /\  P  e.  A
)  ->  E. y  e.  RR+  ( P (
ball `  D )
y )  C_  A
)
32adantr 274 . 2  |-  ( ( ( D  e.  ( *Met `  X
)  /\  A  e.  J  /\  P  e.  A
)  /\  R  e.  RR+ )  ->  E. y  e.  RR+  ( P (
ball `  D )
y )  C_  A
)
4 simp1 992 . . . . . . 7  |-  ( ( D  e.  ( *Met `  X )  /\  A  e.  J  /\  P  e.  A
)  ->  D  e.  ( *Met `  X
) )
51mopnss 13244 . . . . . . . . 9  |-  ( ( D  e.  ( *Met `  X )  /\  A  e.  J
)  ->  A  C_  X
)
65sselda 3147 . . . . . . . 8  |-  ( ( ( D  e.  ( *Met `  X
)  /\  A  e.  J )  /\  P  e.  A )  ->  P  e.  X )
763impa 1189 . . . . . . 7  |-  ( ( D  e.  ( *Met `  X )  /\  A  e.  J  /\  P  e.  A
)  ->  P  e.  X )
84, 7jca 304 . . . . . 6  |-  ( ( D  e.  ( *Met `  X )  /\  A  e.  J  /\  P  e.  A
)  ->  ( D  e.  ( *Met `  X )  /\  P  e.  X ) )
9 ssblex 13225 . . . . . 6  |-  ( ( ( D  e.  ( *Met `  X
)  /\  P  e.  X )  /\  ( R  e.  RR+  /\  y  e.  RR+ ) )  ->  E. x  e.  RR+  (
x  <  R  /\  ( P ( ball `  D
) x )  C_  ( P ( ball `  D
) y ) ) )
108, 9sylan 281 . . . . 5  |-  ( ( ( D  e.  ( *Met `  X
)  /\  A  e.  J  /\  P  e.  A
)  /\  ( R  e.  RR+  /\  y  e.  RR+ ) )  ->  E. x  e.  RR+  ( x  < 
R  /\  ( P
( ball `  D )
x )  C_  ( P ( ball `  D
) y ) ) )
1110anassrs 398 . . . 4  |-  ( ( ( ( D  e.  ( *Met `  X )  /\  A  e.  J  /\  P  e.  A )  /\  R  e.  RR+ )  /\  y  e.  RR+ )  ->  E. x  e.  RR+  ( x  < 
R  /\  ( P
( ball `  D )
x )  C_  ( P ( ball `  D
) y ) ) )
12 sstr 3155 . . . . . . 7  |-  ( ( ( P ( ball `  D ) x ) 
C_  ( P (
ball `  D )
y )  /\  ( P ( ball `  D
) y )  C_  A )  ->  ( P ( ball `  D
) x )  C_  A )
1312expcom 115 . . . . . 6  |-  ( ( P ( ball `  D
) y )  C_  A  ->  ( ( P ( ball `  D
) x )  C_  ( P ( ball `  D
) y )  -> 
( P ( ball `  D ) x ) 
C_  A ) )
1413anim2d 335 . . . . 5  |-  ( ( P ( ball `  D
) y )  C_  A  ->  ( ( x  <  R  /\  ( P ( ball `  D
) x )  C_  ( P ( ball `  D
) y ) )  ->  ( x  < 
R  /\  ( P
( ball `  D )
x )  C_  A
) ) )
1514reximdv 2571 . . . 4  |-  ( ( P ( ball `  D
) y )  C_  A  ->  ( E. x  e.  RR+  ( x  < 
R  /\  ( P
( ball `  D )
x )  C_  ( P ( ball `  D
) y ) )  ->  E. x  e.  RR+  ( x  <  R  /\  ( P ( ball `  D
) x )  C_  A ) ) )
1611, 15syl5com 29 . . 3  |-  ( ( ( ( D  e.  ( *Met `  X )  /\  A  e.  J  /\  P  e.  A )  /\  R  e.  RR+ )  /\  y  e.  RR+ )  ->  (
( P ( ball `  D ) y ) 
C_  A  ->  E. x  e.  RR+  ( x  < 
R  /\  ( P
( ball `  D )
x )  C_  A
) ) )
1716rexlimdva 2587 . 2  |-  ( ( ( D  e.  ( *Met `  X
)  /\  A  e.  J  /\  P  e.  A
)  /\  R  e.  RR+ )  ->  ( E. y  e.  RR+  ( P ( ball `  D
) y )  C_  A  ->  E. x  e.  RR+  ( x  <  R  /\  ( P ( ball `  D
) x )  C_  A ) ) )
183, 17mpd 13 1  |-  ( ( ( D  e.  ( *Met `  X
)  /\  A  e.  J  /\  P  e.  A
)  /\  R  e.  RR+ )  ->  E. x  e.  RR+  ( x  < 
R  /\  ( P
( ball `  D )
x )  C_  A
) )
Colors of variables: wff set class
Syntax hints:    -> wi 4    /\ wa 103    /\ w3a 973    = wceq 1348    e. wcel 2141   E.wrex 2449    C_ wss 3121   class class class wbr 3989   ` cfv 5198  (class class class)co 5853    < clt 7954   RR+crp 9610   *Metcxmet 12774   ballcbl 12776   MetOpencmopn 12779
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 609  ax-in2 610  ax-io 704  ax-5 1440  ax-7 1441  ax-gen 1442  ax-ie1 1486  ax-ie2 1487  ax-8 1497  ax-10 1498  ax-11 1499  ax-i12 1500  ax-bndl 1502  ax-4 1503  ax-17 1519  ax-i9 1523  ax-ial 1527  ax-i5r 1528  ax-13 2143  ax-14 2144  ax-ext 2152  ax-coll 4104  ax-sep 4107  ax-nul 4115  ax-pow 4160  ax-pr 4194  ax-un 4418  ax-setind 4521  ax-iinf 4572  ax-cnex 7865  ax-resscn 7866  ax-1cn 7867  ax-1re 7868  ax-icn 7869  ax-addcl 7870  ax-addrcl 7871  ax-mulcl 7872  ax-mulrcl 7873  ax-addcom 7874  ax-mulcom 7875  ax-addass 7876  ax-mulass 7877  ax-distr 7878  ax-i2m1 7879  ax-0lt1 7880  ax-1rid 7881  ax-0id 7882  ax-rnegex 7883  ax-precex 7884  ax-cnre 7885  ax-pre-ltirr 7886  ax-pre-ltwlin 7887  ax-pre-lttrn 7888  ax-pre-apti 7889  ax-pre-ltadd 7890  ax-pre-mulgt0 7891  ax-pre-mulext 7892  ax-arch 7893  ax-caucvg 7894
This theorem depends on definitions:  df-bi 116  df-stab 826  df-dc 830  df-3or 974  df-3an 975  df-tru 1351  df-fal 1354  df-nf 1454  df-sb 1756  df-eu 2022  df-mo 2023  df-clab 2157  df-cleq 2163  df-clel 2166  df-nfc 2301  df-ne 2341  df-nel 2436  df-ral 2453  df-rex 2454  df-reu 2455  df-rmo 2456  df-rab 2457  df-v 2732  df-sbc 2956  df-csb 3050  df-dif 3123  df-un 3125  df-in 3127  df-ss 3134  df-nul 3415  df-if 3527  df-pw 3568  df-sn 3589  df-pr 3590  df-op 3592  df-uni 3797  df-int 3832  df-iun 3875  df-br 3990  df-opab 4051  df-mpt 4052  df-tr 4088  df-id 4278  df-po 4281  df-iso 4282  df-iord 4351  df-on 4353  df-ilim 4354  df-suc 4356  df-iom 4575  df-xp 4617  df-rel 4618  df-cnv 4619  df-co 4620  df-dm 4621  df-rn 4622  df-res 4623  df-ima 4624  df-iota 5160  df-fun 5200  df-fn 5201  df-f 5202  df-f1 5203  df-fo 5204  df-f1o 5205  df-fv 5206  df-isom 5207  df-riota 5809  df-ov 5856  df-oprab 5857  df-mpo 5858  df-1st 6119  df-2nd 6120  df-recs 6284  df-frec 6370  df-map 6628  df-sup 6961  df-inf 6962  df-pnf 7956  df-mnf 7957  df-xr 7958  df-ltxr 7959  df-le 7960  df-sub 8092  df-neg 8093  df-reap 8494  df-ap 8501  df-div 8590  df-inn 8879  df-2 8937  df-3 8938  df-4 8939  df-n0 9136  df-z 9213  df-uz 9488  df-q 9579  df-rp 9611  df-xneg 9729  df-xadd 9730  df-seqfrec 10402  df-exp 10476  df-cj 10806  df-re 10807  df-im 10808  df-rsqrt 10962  df-abs 10963  df-topgen 12600  df-psmet 12781  df-xmet 12782  df-bl 12784  df-mopn 12785  df-top 12790  df-topon 12803  df-bases 12835
This theorem is referenced by:  limcimolemlt  13427
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