Theorem mopni3 15366

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.

Step	Hyp	Ref	Expression
1		mopni.1	. . . 4 |- J = ( MetOpen ` D )
2	1	mopni2 15365	. . 3 |- ( ( D e. ( *Met ` X ) /\ A e. J /\ P e. A ) -> E. y e. RR+ ( P ( ball ` D ) y ) C_ A )
3	2	adantr 276	. 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 1024	. . . . . . 7 |- ( ( D e. ( *Met ` X ) /\ A e. J /\ P e. A ) -> D e. ( *Met ` X ) )
5	1	mopnss 15332	. . . . . . . . 9 |- ( ( D e. ( *Met ` X ) /\ A e. J ) -> A C_ X )
6	5	sselda 3240	. . . . . . . 8 |- ( ( ( D e. ( *Met ` X ) /\ A e. J ) /\ P e. A ) -> P e. X )
7	6	3impa 1221	. . . . . . 7 |- ( ( D e. ( *Met ` X ) /\ A e. J /\ P e. A ) -> P e. X )
8	4, 7	jca 306	. . . . . 6 |- ( ( D e. ( *Met ` X ) /\ A e. J /\ P e. A ) -> ( D e. ( *Met ` X ) /\ P e. X ) )
9		ssblex 15313	. . . . . 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 ) ) )
10	8, 9	sylan 283	. . . . 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 ) ) )
11	10	anassrs 400	. . . 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 3248	. . . . . . 7 |- ( ( ( P ( ball ` D ) x ) C_ ( P ( ball ` D ) y ) /\ ( P ( ball ` D ) y ) C_ A ) -> ( P ( ball ` D ) x ) C_ A )
13	12	expcom 116	. . . . . 6 |- ( ( P ( ball ` D ) y ) C_ A -> ( ( P ( ball ` D ) x ) C_ ( P ( ball ` D ) y ) -> ( P ( ball ` D ) x ) C_ A ) )
14	13	anim2d 337	. . . . 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 ) ) )
15	14	reximdv 2645	. . . 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 ) ) )
16	11, 15	syl5com 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 ) ) )
17	16	rexlimdva 2662	. 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 ) ) )
18	3, 17	mpd 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 ) )

Syntax hints:   -> wi 4   /\ wa 104   /\ w3a 1005   = wceq 1398   e. wcel 2205   E.wrex 2523   C_ wss 3213   class class class wbr 4111   ` cfv 5354  (class class class)co 6052   < clt 8310   RR+crp 9989   *Metcxmet 14701   ballcbl 14703   MetOpencmopn 14706

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 106  ax-ia2 107  ax-ia3 108  ax-in1 619  ax-in2 620  ax-io 717  ax-5 1496  ax-7 1497  ax-gen 1498  ax-ie1 1542  ax-ie2 1543  ax-8 1553  ax-10 1554  ax-11 1555  ax-i12 1556  ax-bndl 1558  ax-4 1559  ax-17 1575  ax-i9 1579  ax-ial 1583  ax-i5r 1584  ax-13 2207  ax-14 2208  ax-ext 2216  ax-coll 4227  ax-sep 4230  ax-nul 4238  ax-pow 4289  ax-pr 4324  ax-un 4556  ax-setind 4661  ax-iinf 4712  ax-cnex 8220  ax-resscn 8221  ax-1cn 8222  ax-1re 8223  ax-icn 8224  ax-addcl 8225  ax-addrcl 8226  ax-mulcl 8227  ax-mulrcl 8228  ax-addcom 8229  ax-mulcom 8230  ax-addass 8231  ax-mulass 8232  ax-distr 8233  ax-i2m1 8234  ax-0lt1 8235  ax-1rid 8236  ax-0id 8237  ax-rnegex 8238  ax-precex 8239  ax-cnre 8240  ax-pre-ltirr 8241  ax-pre-ltwlin 8242  ax-pre-lttrn 8243  ax-pre-apti 8244  ax-pre-ltadd 8245  ax-pre-mulgt0 8246  ax-pre-mulext 8247  ax-arch 8248  ax-caucvg 8249

This theorem depends on definitions:  df-bi 117  df-stab 839  df-dc 843  df-3or 1006  df-3an 1007  df-tru 1401  df-fal 1404  df-nf 1510  df-sb 1812  df-eu 2085  df-mo 2086  df-clab 2221  df-cleq 2227  df-clel 2230  df-nfc 2375  df-ne 2415  df-nel 2510  df-ral 2527  df-rex 2528  df-reu 2529  df-rmo 2530  df-rab 2531  df-v 2817  df-sbc 3045  df-csb 3141  df-dif 3215  df-un 3217  df-in 3219  df-ss 3226  df-nul 3511  df-if 3623  df-pw 3673  df-sn 3697  df-pr 3698  df-op 3700  df-uni 3917  df-int 3952  df-iun 3995  df-br 4112  df-opab 4174  df-mpt 4175  df-tr 4211  df-id 4416  df-po 4419  df-iso 4420  df-iord 4489  df-on 4491  df-ilim 4492  df-suc 4494  df-iom 4715  df-xp 4757  df-rel 4758  df-cnv 4759  df-co 4760  df-dm 4761  df-rn 4762  df-res 4763  df-ima 4764  df-iota 5314  df-fun 5356  df-fn 5357  df-f 5358  df-f1 5359  df-fo 5360  df-f1o 5361  df-fv 5362  df-isom 5363  df-riota 6005  df-ov 6055  df-oprab 6056  df-mpo 6057  df-1st 6336  df-2nd 6337  df-recs 6538  df-frec 6624  df-map 6886  df-sup 7277  df-inf 7278  df-pnf 8312  df-mnf 8313  df-xr 8314  df-ltxr 8315  df-le 8316  df-sub 8448  df-neg 8449  df-reap 8851  df-ap 8858  df-div 8949  df-inn 9240  df-2 9298  df-3 9299  df-4 9300  df-n0 9499  df-z 9580  df-uz 9857  df-q 9955  df-rp 9990  df-xneg 10108  df-xadd 10109  df-seqfrec 10814  df-exp 10905  df-cj 11531  df-re 11532  df-im 11533  df-rsqrt 11687  df-abs 11688  df-topgen 13490  df-psmet 14708  df-xmet 14709  df-bl 14711  df-mopn 14712  df-top 14880  df-topon 14893  df-bases 14925

This theorem is referenced by:  limcimolemlt  15546