Theorem repiecelem 17245

Description: Lemma for repiecele0 17246, repiecege0 17247, and repiecef 17248. The function H is defined everywhere. (Contributed by Jim Kingdon, 27-Apr-2026.)

Hypotheses

Ref	Expression
repiece.f	|- ( ph -> F : ( -oo (,] 0 ) --> RR )
repiece.g	|- ( ph -> G : ( 0 [,) +oo ) --> RR )
repiece.0	|- ( ph -> ( F ` 0 ) = ( G ` 0 ) )
repiece.h	|- H = ( x e. RR |-> ( ( ( F ` inf ( { x , 0 } , RR , < ) ) + ( G ` sup ( { x , 0 } , RR , < ) ) ) - ( F ` 0 ) ) )

Assertion

Ref	Expression
repiecelem	|- ( ( ph /\ A e. RR ) -> ( ( ( F ` inf ( { A , 0 } , RR , < ) ) + ( G ` sup ( { A , 0 } , RR , < ) ) ) - ( F ` 0 ) ) e. RR )

Distinct variable groups:   x, A   x, F   x, G

Allowed substitution hints:   ph( x)   H( x)

Proof of Theorem repiecelem

Step	Hyp	Ref	Expression
1		repiece.f	. . . . 5 |- ( ph -> F : ( -oo (,] 0 ) --> RR )
2	1	adantr 276	. . . 4 |- ( ( ph /\ A e. RR ) -> F : ( -oo (,] 0 ) --> RR )
3		simpr 110	. . . . . 6 |- ( ( ph /\ A e. RR ) -> A e. RR )
4		0re 8327	. . . . . 6 |- 0 e. RR
5		mincl 12015	. . . . . 6 |- ( ( A e. RR /\ 0 e. RR ) -> inf ( { A , 0 } , RR , < ) e. RR )
6	3, 4, 5	sylancl 417	. . . . 5 |- ( ( ph /\ A e. RR ) -> inf ( { A , 0 } , RR , < ) e. RR )
7		mnflt 10196	. . . . . 6 |- (inf ( { A , 0 } , RR , < ) e. RR -> -oo < inf ( { A , 0 } , RR , < ) )
8	6, 7	syl 14	. . . . 5 |- ( ( ph /\ A e. RR ) -> -oo < inf ( { A , 0 } , RR , < ) )
9		min2inf 12017	. . . . . 6 |- ( ( A e. RR /\ 0 e. RR ) -> inf ( { A , 0 } , RR , < ) <_ 0 )
10	3, 4, 9	sylancl 417	. . . . 5 |- ( ( ph /\ A e. RR ) -> inf ( { A , 0 } , RR , < ) <_ 0 )
11		mnfxr 8383	. . . . . 6 |- -oo e. RR*
12		elioc2 10349	. . . . . 6 |- ( ( -oo e. RR* /\ 0 e. RR ) -> (inf ( { A , 0 } , RR , < ) e. ( -oo (,] 0 ) <-> (inf ( { A , 0 } , RR , < ) e. RR /\ -oo < inf ( { A , 0 } , RR , < ) /\ inf ( { A , 0 } , RR , < ) <_ 0 ) ) )
13	11, 4, 12	mp2an 430	. . . . 5 |- (inf ( { A , 0 } , RR , < ) e. ( -oo (,] 0 ) <-> (inf ( { A , 0 } , RR , < ) e. RR /\ -oo < inf ( { A , 0 } , RR , < ) /\ inf ( { A , 0 } , RR , < ) <_ 0 ) )
14	6, 8, 10, 13	syl3anbrc 1212	. . . 4 |- ( ( ph /\ A e. RR ) -> inf ( { A , 0 } , RR , < ) e. ( -oo (,] 0 ) )
15	2, 14	ffvelcdmd 5844	. . 3 |- ( ( ph /\ A e. RR ) -> ( F ` inf ( { A , 0 } , RR , < ) ) e. RR )
16		repiece.g	. . . . 5 |- ( ph -> G : ( 0 [,) +oo ) --> RR )
17	16	adantr 276	. . . 4 |- ( ( ph /\ A e. RR ) -> G : ( 0 [,) +oo ) --> RR )
18		maxcl 11993	. . . . . 6 |- ( ( A e. RR /\ 0 e. RR ) -> sup ( { A , 0 } , RR , < ) e. RR )
19	3, 4, 18	sylancl 417	. . . . 5 |- ( ( ph /\ A e. RR ) -> sup ( { A , 0 } , RR , < ) e. RR )
20		maxle2 11995	. . . . . 6 |- ( ( A e. RR /\ 0 e. RR ) -> 0 <_ sup ( { A , 0 } , RR , < ) )
21	3, 4, 20	sylancl 417	. . . . 5 |- ( ( ph /\ A e. RR ) -> 0 <_ sup ( { A , 0 } , RR , < ) )
22	19	ltpnfd 10194	. . . . 5 |- ( ( ph /\ A e. RR ) -> sup ( { A , 0 } , RR , < ) < +oo )
23		pnfxr 8379	. . . . . 6 |- +oo e. RR*
24		elico2 10350	. . . . . 6 |- ( ( 0 e. RR /\ +oo e. RR* ) -> ( sup ( { A , 0 } , RR , < ) e. ( 0 [,) +oo ) <-> ( sup ( { A , 0 } , RR , < ) e. RR /\ 0 <_ sup ( { A , 0 } , RR , < ) /\ sup ( { A , 0 } , RR , < ) < +oo ) ) )
25	4, 23, 24	mp2an 430	. . . . 5 |- ( sup ( { A , 0 } , RR , < ) e. ( 0 [,) +oo ) <-> ( sup ( { A , 0 } , RR , < ) e. RR /\ 0 <_ sup ( { A , 0 } , RR , < ) /\ sup ( { A , 0 } , RR , < ) < +oo ) )
26	19, 21, 22, 25	syl3anbrc 1212	. . . 4 |- ( ( ph /\ A e. RR ) -> sup ( { A , 0 } , RR , < ) e. ( 0 [,) +oo ) )
27	17, 26	ffvelcdmd 5844	. . 3 |- ( ( ph /\ A e. RR ) -> ( G ` sup ( { A , 0 } , RR , < ) ) e. RR )
28	15, 27	readdcld 8356	. 2 |- ( ( ph /\ A e. RR ) -> ( ( F ` inf ( { A , 0 } , RR , < ) ) + ( G ` sup ( { A , 0 } , RR , < ) ) ) e. RR )
29		0xr 8373	. . . . 5 |- 0 e. RR*
30		mnflt0 10197	. . . . 5 |- -oo < 0
31		ubioc1 10342	. . . . 5 |- ( ( -oo e. RR* /\ 0 e. RR* /\ -oo < 0 ) -> 0 e. ( -oo (,] 0 ) )
32	11, 29, 30, 31	mp3an 1378	. . . 4 |- 0 e. ( -oo (,] 0 )
33	32	a1i 9	. . 3 |- ( ( ph /\ A e. RR ) -> 0 e. ( -oo (,] 0 ) )
34	2, 33	ffvelcdmd 5844	. 2 |- ( ( ph /\ A e. RR ) -> ( F ` 0 ) e. RR )
35	28, 34	resubcld 8710	1 |- ( ( ph /\ A e. RR ) -> ( ( ( F ` inf ( { A , 0 } , RR , < ) ) + ( G ` sup ( { A , 0 } , RR , < ) ) ) - ( F ` 0 ) ) e. RR )

This proof depends on syntax axioms:   -> wi 4   /\ wa 104   <-> wb 105   /\ w3a 1009   = wceq 1402   e. wcel 2209   {cpr 3710   class class class wbr 4130   |-> cmpt 4192   -->wf 5373   ` cfv 5377  (class class class)co 6085   supcsup 7323  infcinf 7324   RRcr 8179   0cc0 8180   + caddc 8183   +oocpnf 8358   -oocmnf 8359   RR*cxr 8360   < clt 8361   <_ cle 8362   - cmin 8499   (,]cioc 10302   [,)cico 10303

This proof depends on axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 106  ax-ia2 107  ax-ia3 108  ax-in1 623  ax-in2 624  ax-io 721  ax-5 1500  ax-7 1501  ax-gen 1502  ax-ie1 1546  ax-ie2 1547  ax-8 1557  ax-10 1558  ax-11 1559  ax-i12 1560  ax-bndl 1562  ax-4 1563  ax-17 1579  ax-i9 1583  ax-ial 1587  ax-i5r 1588  ax-14 2212  ax-ext 2220  ax-coll 4246  ax-sep 4249  ax-nul 4259  ax-pow 4311  ax-pr 4346  ax-un 4578  ax-setind 4684  ax-iinf 4735  ax-cnex 8271  ax-resscn 8272  ax-1cn 8273  ax-1re 8274  ax-icn 8275  ax-addcl 8276  ax-addrcl 8277  ax-mulcl 8278  ax-mulrcl 8279  ax-addcom 8280  ax-mulcom 8281  ax-addass 8282  ax-mulass 8283  ax-distr 8284  ax-i2m1 8285  ax-0lt1 8286  ax-1rid 8287  ax-0id 8288  ax-rnegex 8289  ax-precex 8290  ax-cnre 8291  ax-pre-ltirr 8292  ax-pre-ltwlin 8293  ax-pre-lttrn 8294  ax-pre-apti 8295  ax-pre-ltadd 8296  ax-pre-mulgt0 8297  ax-pre-mulext 8298  ax-arch 8299  ax-caucvg 8300

This proof depends on definitions:  df-bi 117  df-dc 847  df-3or 1010  df-3an 1011  df-tru 1405  df-fal 1408  df-nf 1514  df-sb 1816  df-eu 2089  df-mo 2090  df-clab 2225  df-cleq 2231  df-clel 2234  df-nfc 2381  df-ne 2421  df-nel 2516  df-ral 2533  df-rex 2534  df-reu 2535  df-rmo 2536  df-rab 2537  df-v 2823  df-sbc 3052  df-csb 3148  df-dif 3222  df-un 3224  df-in 3226  df-ss 3233  df-nul 3521  df-if 3639  df-pw 3690  df-sn 3715  df-pr 3716  df-op 3718  df-uni 3936  df-int 3971  df-iun 4014  df-br 4131  df-opab 4193  df-mpt 4194  df-tr 4230  df-id 4438  df-po 4441  df-iso 4442  df-iord 4511  df-on 4513  df-ilim 4514  df-suc 4516  df-iom 4738  df-xp 4780  df-rel 4781  df-cnv 4782  df-co 4783  df-dm 4784  df-rn 4785  df-res 4786  df-ima 4787  df-iota 5337  df-fun 5379  df-fn 5380  df-f 5381  df-f1 5382  df-fo 5383  df-f1o 5384  df-fv 5385  df-isom 5386  df-riota 6038  df-ov 6088  df-oprab 6089  df-mpo 6090  df-1st 6374  df-2nd 6375  df-recs 6576  df-frec 6662  df-sup 7325  df-inf 7326  df-pnf 8363  df-mnf 8364  df-xr 8365  df-ltxr 8366  df-le 8367  df-sub 8501  df-neg 8502  df-reap 8906  df-ap 8913  df-div 9006  df-inn 9308  df-2 9366  df-3 9367  df-4 9368  df-n0 9569  df-z 9650  df-uz 9932  df-rp 10066  df-ioc 10306  df-ico 10307  df-seqfrec 10900  df-exp 10991  df-cj 11623  df-re 11624  df-im 11625  df-rsqrt 11780  df-abs 11781

This theorem is used by:  repiecele0  17246  repiecege0  17247  repiecef  17248