Theorem ivthreinc 15372

Description: Restating the intermediate value theorem. Given a hypothesis stating the intermediate value theorem (in a strong form which is not provable given our axioms alone), provide a conclusion similar to the theorem as stated in the Metamath Proof Explorer (which is also similar to how we state the theorem for a strictly monotonic function at ivthinc 15370). Being able to have a hypothesis stating the intermediate value theorem will be helpful when it comes time to show that it implies a constructive taboo. This version of the theorem requires that the function F is continuous on the entire real line, not just ( A [,] B ) which may be an unnecessary condition but which is sufficient for the way we want to use it. (Contributed by Jim Kingdon, 7-Jul-2025.)

Hypotheses

Ref	Expression
ivthreinc.1	|- ( ph -> A e. RR )
ivthreinc.2	|- ( ph -> B e. RR )
ivthreinc.3	|- ( ph -> U e. RR )
ivthreinc.4	|- ( ph -> A < B )
ivthreinc.7	|- ( ph -> F e. ( RR -cn-> RR ) )
ivthreinc.9	|- ( ph -> ( ( F ` A ) < U /\ U < ( F ` B ) ) )
ivthreinc.i	|- ( ph -> A. f ( f e. ( RR -cn-> RR ) -> A. a e. RR A. b e. RR ( ( a < b /\ ( f ` a ) < 0 /\ 0 < ( f ` b ) ) -> E. x e. RR ( a < x /\ x < b /\ ( f ` x ) = 0 ) ) ) )

Assertion

Ref	Expression
ivthreinc	|- ( ph -> E. c e. ( A (,) B ) ( F ` c ) = U )

Distinct variable groups:   A, a, b, x   A, c, x   B, b, x   B, c   F, a, b, f, x   F, c   U, a, b, f, x   U, c   ph, x

Allowed substitution hints:   ph( f, a, b, c)   A( f)   B( f, a)

Proof of Theorem ivthreinc

Dummy variable r is distinct from all other variables.

Step	Hyp	Ref	Expression
1		ivthreinc.4	. . . 4 |- ( ph -> A < B )
2		eqid 2231	. . . . . 6 |- ( r e. RR |-> ( ( F ` r ) - U ) ) = ( r e. RR |-> ( ( F ` r ) - U ) )
3		fveq2 5639	. . . . . . 7 |- ( r = A -> ( F ` r ) = ( F ` A ) )
4	3	oveq1d 6033	. . . . . 6 |- ( r = A -> ( ( F ` r ) - U ) = ( ( F ` A ) - U ) )
5		ivthreinc.1	. . . . . 6 |- ( ph -> A e. RR )
6		ivthreinc.7	. . . . . . . . 9 |- ( ph -> F e. ( RR -cn-> RR ) )
7		cncff 15304	. . . . . . . . 9 |- ( F e. ( RR -cn-> RR ) -> F : RR --> RR )
8	6, 7	syl 14	. . . . . . . 8 |- ( ph -> F : RR --> RR )
9	8, 5	ffvelcdmd 5783	. . . . . . 7 |- ( ph -> ( F ` A ) e. RR )
10		ivthreinc.3	. . . . . . 7 |- ( ph -> U e. RR )
11	9, 10	resubcld 8560	. . . . . 6 |- ( ph -> ( ( F ` A ) - U ) e. RR )
12	2, 4, 5, 11	fvmptd3 5740	. . . . 5 |- ( ph -> ( ( r e. RR |-> ( ( F ` r ) - U ) ) ` A ) = ( ( F ` A ) - U ) )
13		ivthreinc.9	. . . . . . 7 |- ( ph -> ( ( F ` A ) < U /\ U < ( F ` B ) ) )
14	13	simpld 112	. . . . . 6 |- ( ph -> ( F ` A ) < U )
15	9, 10	sublt0d 8750	. . . . . 6 |- ( ph -> ( ( ( F ` A ) - U ) < 0 <-> ( F ` A ) < U ) )
16	14, 15	mpbird 167	. . . . 5 |- ( ph -> ( ( F ` A ) - U ) < 0 )
17	12, 16	eqbrtrd 4110	. . . 4 |- ( ph -> ( ( r e. RR |-> ( ( F ` r ) - U ) ) ` A ) < 0 )
18	13	simprd 114	. . . . . 6 |- ( ph -> U < ( F ` B ) )
19		ivthreinc.2	. . . . . . . 8 |- ( ph -> B e. RR )
20	8, 19	ffvelcdmd 5783	. . . . . . 7 |- ( ph -> ( F ` B ) e. RR )
21	10, 20	posdifd 8712	. . . . . 6 |- ( ph -> ( U < ( F ` B ) <-> 0 < ( ( F ` B ) - U ) ) )
22	18, 21	mpbid 147	. . . . 5 |- ( ph -> 0 < ( ( F ` B ) - U ) )
23		fveq2 5639	. . . . . . 7 |- ( r = B -> ( F ` r ) = ( F ` B ) )
24	23	oveq1d 6033	. . . . . 6 |- ( r = B -> ( ( F ` r ) - U ) = ( ( F ` B ) - U ) )
25	20, 10	resubcld 8560	. . . . . 6 |- ( ph -> ( ( F ` B ) - U ) e. RR )
26	2, 24, 19, 25	fvmptd3 5740	. . . . 5 |- ( ph -> ( ( r e. RR |-> ( ( F ` r ) - U ) ) ` B ) = ( ( F ` B ) - U ) )
27	22, 26	breqtrrd 4116	. . . 4 |- ( ph -> 0 < ( ( r e. RR |-> ( ( F ` r ) - U ) ) ` B ) )
28	1, 17, 27	3jca 1203	. . 3 |- ( ph -> ( A < B /\ ( ( r e. RR |-> ( ( F ` r ) - U ) ) ` A ) < 0 /\ 0 < ( ( r e. RR |-> ( ( F ` r ) - U ) ) ` B ) ) )
29		breq2 4092	. . . . . 6 |- ( b = B -> ( A < b <-> A < B ) )
30		fveq2 5639	. . . . . . 7 |- ( b = B -> ( ( r e. RR |-> ( ( F ` r ) - U ) ) ` b ) = ( ( r e. RR |-> ( ( F ` r ) - U ) ) ` B ) )
31	30	breq2d 4100	. . . . . 6 |- ( b = B -> ( 0 < ( ( r e. RR |-> ( ( F ` r ) - U ) ) ` b ) <-> 0 < ( ( r e. RR |-> ( ( F ` r ) - U ) ) ` B ) ) )
32	29, 31	3anbi13d 1350	. . . . 5 |- ( b = B -> ( ( A < b /\ ( ( r e. RR |-> ( ( F ` r ) - U ) ) ` A ) < 0 /\ 0 < ( ( r e. RR |-> ( ( F ` r ) - U ) ) ` b ) ) <-> ( A < B /\ ( ( r e. RR |-> ( ( F ` r ) - U ) ) ` A ) < 0 /\ 0 < ( ( r e. RR |-> ( ( F ` r ) - U ) ) ` B ) ) ) )
33		breq2 4092	. . . . . . 7 |- ( b = B -> ( x < b <-> x < B ) )
34	33	3anbi2d 1353	. . . . . 6 |- ( b = B -> ( ( A < x /\ x < b /\ ( ( r e. RR |-> ( ( F ` r ) - U ) ) ` x ) = 0 ) <-> ( A < x /\ x < B /\ ( ( r e. RR |-> ( ( F ` r ) - U ) ) ` x ) = 0 ) ) )
35	34	rexbidv 2533	. . . . 5 |- ( b = B -> ( E. x e. RR ( A < x /\ x < b /\ ( ( r e. RR |-> ( ( F ` r ) - U ) ) ` x ) = 0 ) <-> E. x e. RR ( A < x /\ x < B /\ ( ( r e. RR |-> ( ( F ` r ) - U ) ) ` x ) = 0 ) ) )
36	32, 35	imbi12d 234	. . . 4 |- ( b = B -> ( ( ( A < b /\ ( ( r e. RR |-> ( ( F ` r ) - U ) ) ` A ) < 0 /\ 0 < ( ( r e. RR |-> ( ( F ` r ) - U ) ) ` b ) ) -> E. x e. RR ( A < x /\ x < b /\ ( ( r e. RR |-> ( ( F ` r ) - U ) ) ` x ) = 0 ) ) <-> ( ( A < B /\ ( ( r e. RR |-> ( ( F ` r ) - U ) ) ` A ) < 0 /\ 0 < ( ( r e. RR |-> ( ( F ` r ) - U ) ) ` B ) ) -> E. x e. RR ( A < x /\ x < B /\ ( ( r e. RR |-> ( ( F ` r ) - U ) ) ` x ) = 0 ) ) ) )
37		breq1 4091	. . . . . . . 8 |- ( a = A -> ( a < b <-> A < b ) )
38		fveq2 5639	. . . . . . . . 9 |- ( a = A -> ( ( r e. RR |-> ( ( F ` r ) - U ) ) ` a ) = ( ( r e. RR |-> ( ( F ` r ) - U ) ) ` A ) )
39	38	breq1d 4098	. . . . . . . 8 |- ( a = A -> ( ( ( r e. RR |-> ( ( F ` r ) - U ) ) ` a ) < 0 <-> ( ( r e. RR |-> ( ( F ` r ) - U ) ) ` A ) < 0 ) )
40	37, 39	3anbi12d 1349	. . . . . . 7 |- ( a = A -> ( ( a < b /\ ( ( r e. RR |-> ( ( F ` r ) - U ) ) ` a ) < 0 /\ 0 < ( ( r e. RR |-> ( ( F ` r ) - U ) ) ` b ) ) <-> ( A < b /\ ( ( r e. RR |-> ( ( F ` r ) - U ) ) ` A ) < 0 /\ 0 < ( ( r e. RR |-> ( ( F ` r ) - U ) ) ` b ) ) ) )
41		breq1 4091	. . . . . . . . 9 |- ( a = A -> ( a < x <-> A < x ) )
42	41	3anbi1d 1352	. . . . . . . 8 |- ( a = A -> ( ( a < x /\ x < b /\ ( ( r e. RR |-> ( ( F ` r ) - U ) ) ` x ) = 0 ) <-> ( A < x /\ x < b /\ ( ( r e. RR |-> ( ( F ` r ) - U ) ) ` x ) = 0 ) ) )
43	42	rexbidv 2533	. . . . . . 7 |- ( a = A -> ( E. x e. RR ( a < x /\ x < b /\ ( ( r e. RR |-> ( ( F ` r ) - U ) ) ` x ) = 0 ) <-> E. x e. RR ( A < x /\ x < b /\ ( ( r e. RR |-> ( ( F ` r ) - U ) ) ` x ) = 0 ) ) )
44	40, 43	imbi12d 234	. . . . . 6 |- ( a = A -> ( ( ( a < b /\ ( ( r e. RR |-> ( ( F ` r ) - U ) ) ` a ) < 0 /\ 0 < ( ( r e. RR |-> ( ( F ` r ) - U ) ) ` b ) ) -> E. x e. RR ( a < x /\ x < b /\ ( ( r e. RR |-> ( ( F ` r ) - U ) ) ` x ) = 0 ) ) <-> ( ( A < b /\ ( ( r e. RR |-> ( ( F ` r ) - U ) ) ` A ) < 0 /\ 0 < ( ( r e. RR |-> ( ( F ` r ) - U ) ) ` b ) ) -> E. x e. RR ( A < x /\ x < b /\ ( ( r e. RR |-> ( ( F ` r ) - U ) ) ` x ) = 0 ) ) ) )
45	44	ralbidv 2532	. . . . 5 |- ( a = A -> ( A. b e. RR ( ( a < b /\ ( ( r e. RR |-> ( ( F ` r ) - U ) ) ` a ) < 0 /\ 0 < ( ( r e. RR |-> ( ( F ` r ) - U ) ) ` b ) ) -> E. x e. RR ( a < x /\ x < b /\ ( ( r e. RR |-> ( ( F ` r ) - U ) ) ` x ) = 0 ) ) <-> A. b e. RR ( ( A < b /\ ( ( r e. RR |-> ( ( F ` r ) - U ) ) ` A ) < 0 /\ 0 < ( ( r e. RR |-> ( ( F ` r ) - U ) ) ` b ) ) -> E. x e. RR ( A < x /\ x < b /\ ( ( r e. RR |-> ( ( F ` r ) - U ) ) ` x ) = 0 ) ) ) )
46	8	ffvelcdmda 5782	. . . . . . . . 9 |- ( ( ph /\ r e. RR ) -> ( F ` r ) e. RR )
47	10	adantr 276	. . . . . . . . 9 |- ( ( ph /\ r e. RR ) -> U e. RR )
48	46, 47	resubcld 8560	. . . . . . . 8 |- ( ( ph /\ r e. RR ) -> ( ( F ` r ) - U ) e. RR )
49	48	fmpttd 5802	. . . . . . 7 |- ( ph -> ( r e. RR |-> ( ( F ` r ) - U ) ) : RR --> RR )
50		ax-resscn 8124	. . . . . . . . 9 |- RR C_ CC
51	50	a1i 9	. . . . . . . 8 |- ( ph -> RR C_ CC )
52	8	feqmptd 5699	. . . . . . . . . 10 |- ( ph -> F = ( r e. RR |-> ( F ` r ) ) )
53		ssid 3247	. . . . . . . . . . . 12 |- CC C_ CC
54		cncfss 15310	. . . . . . . . . . . 12 |- ( ( RR C_ CC /\ CC C_ CC ) -> ( RR -cn-> RR ) C_ ( RR -cn-> CC ) )
55	50, 53, 54	mp2an 426	. . . . . . . . . . 11 |- ( RR -cn-> RR ) C_ ( RR -cn-> CC )
56	55, 6	sselid 3225	. . . . . . . . . 10 |- ( ph -> F e. ( RR -cn-> CC ) )
57	52, 56	eqeltrrd 2309	. . . . . . . . 9 |- ( ph -> ( r e. RR |-> ( F ` r ) ) e. ( RR -cn-> CC ) )
58	10	recnd 8208	. . . . . . . . . 10 |- ( ph -> U e. CC )
59	53	a1i 9	. . . . . . . . . 10 |- ( ph -> CC C_ CC )
60		cncfmptc 15323	. . . . . . . . . 10 |- ( ( U e. CC /\ RR C_ CC /\ CC C_ CC ) -> ( r e. RR |-> U ) e. ( RR -cn-> CC ) )
61	58, 51, 59, 60	syl3anc 1273	. . . . . . . . 9 |- ( ph -> ( r e. RR |-> U ) e. ( RR -cn-> CC ) )
62	57, 61	subcncf 15340	. . . . . . . 8 |- ( ph -> ( r e. RR |-> ( ( F ` r ) - U ) ) e. ( RR -cn-> CC ) )
63		cncfcdm 15309	. . . . . . . 8 |- ( ( RR C_ CC /\ ( r e. RR |-> ( ( F ` r ) - U ) ) e. ( RR -cn-> CC ) ) -> ( ( r e. RR |-> ( ( F ` r ) - U ) ) e. ( RR -cn-> RR ) <-> ( r e. RR |-> ( ( F ` r ) - U ) ) : RR --> RR ) )
64	51, 62, 63	syl2anc 411	. . . . . . 7 |- ( ph -> ( ( r e. RR |-> ( ( F ` r ) - U ) ) e. ( RR -cn-> RR ) <-> ( r e. RR |-> ( ( F ` r ) - U ) ) : RR --> RR ) )
65	49, 64	mpbird 167	. . . . . 6 |- ( ph -> ( r e. RR |-> ( ( F ` r ) - U ) ) e. ( RR -cn-> RR ) )
66		ivthreinc.i	. . . . . . 7 |- ( ph -> A. f ( f e. ( RR -cn-> RR ) -> A. a e. RR A. b e. RR ( ( a < b /\ ( f ` a ) < 0 /\ 0 < ( f ` b ) ) -> E. x e. RR ( a < x /\ x < b /\ ( f ` x ) = 0 ) ) ) )
67		reex 8166	. . . . . . . . 9 |- RR e. _V
68	67	mptex 5880	. . . . . . . 8 |- ( r e. RR |-> ( ( F ` r ) - U ) ) e. _V
69		eleq1 2294	. . . . . . . . 9 |- ( f = ( r e. RR |-> ( ( F ` r ) - U ) ) -> ( f e. ( RR -cn-> RR ) <-> ( r e. RR |-> ( ( F ` r ) - U ) ) e. ( RR -cn-> RR ) ) )
70		fveq1 5638	. . . . . . . . . . . . . 14 |- ( f = ( r e. RR |-> ( ( F ` r ) - U ) ) -> ( f ` a ) = ( ( r e. RR |-> ( ( F ` r ) - U ) ) ` a ) )
71	70	breq1d 4098	. . . . . . . . . . . . 13 |- ( f = ( r e. RR |-> ( ( F ` r ) - U ) ) -> ( ( f ` a ) < 0 <-> ( ( r e. RR |-> ( ( F ` r ) - U ) ) ` a ) < 0 ) )
72		fveq1 5638	. . . . . . . . . . . . . 14 |- ( f = ( r e. RR |-> ( ( F ` r ) - U ) ) -> ( f ` b ) = ( ( r e. RR |-> ( ( F ` r ) - U ) ) ` b ) )
73	72	breq2d 4100	. . . . . . . . . . . . 13 |- ( f = ( r e. RR |-> ( ( F ` r ) - U ) ) -> ( 0 < ( f ` b ) <-> 0 < ( ( r e. RR |-> ( ( F ` r ) - U ) ) ` b ) ) )
74	71, 73	3anbi23d 1351	. . . . . . . . . . . 12 |- ( f = ( r e. RR |-> ( ( F ` r ) - U ) ) -> ( ( a < b /\ ( f ` a ) < 0 /\ 0 < ( f ` b ) ) <-> ( a < b /\ ( ( r e. RR |-> ( ( F ` r ) - U ) ) ` a ) < 0 /\ 0 < ( ( r e. RR |-> ( ( F ` r ) - U ) ) ` b ) ) ) )
75		fveq1 5638	. . . . . . . . . . . . . . 15 |- ( f = ( r e. RR |-> ( ( F ` r ) - U ) ) -> ( f ` x ) = ( ( r e. RR |-> ( ( F ` r ) - U ) ) ` x ) )
76	75	eqeq1d 2240	. . . . . . . . . . . . . 14 |- ( f = ( r e. RR |-> ( ( F ` r ) - U ) ) -> ( ( f ` x ) = 0 <-> ( ( r e. RR |-> ( ( F ` r ) - U ) ) ` x ) = 0 ) )
77	76	3anbi3d 1354	. . . . . . . . . . . . 13 |- ( f = ( r e. RR |-> ( ( F ` r ) - U ) ) -> ( ( a < x /\ x < b /\ ( f ` x ) = 0 ) <-> ( a < x /\ x < b /\ ( ( r e. RR |-> ( ( F ` r ) - U ) ) ` x ) = 0 ) ) )
78	77	rexbidv 2533	. . . . . . . . . . . 12 |- ( f = ( r e. RR |-> ( ( F ` r ) - U ) ) -> ( E. x e. RR ( a < x /\ x < b /\ ( f ` x ) = 0 ) <-> E. x e. RR ( a < x /\ x < b /\ ( ( r e. RR |-> ( ( F ` r ) - U ) ) ` x ) = 0 ) ) )
79	74, 78	imbi12d 234	. . . . . . . . . . 11 |- ( f = ( r e. RR |-> ( ( F ` r ) - U ) ) -> ( ( ( a < b /\ ( f ` a ) < 0 /\ 0 < ( f ` b ) ) -> E. x e. RR ( a < x /\ x < b /\ ( f ` x ) = 0 ) ) <-> ( ( a < b /\ ( ( r e. RR |-> ( ( F ` r ) - U ) ) ` a ) < 0 /\ 0 < ( ( r e. RR |-> ( ( F ` r ) - U ) ) ` b ) ) -> E. x e. RR ( a < x /\ x < b /\ ( ( r e. RR |-> ( ( F ` r ) - U ) ) ` x ) = 0 ) ) ) )
80	79	ralbidv 2532	. . . . . . . . . 10 |- ( f = ( r e. RR |-> ( ( F ` r ) - U ) ) -> ( A. b e. RR ( ( a < b /\ ( f ` a ) < 0 /\ 0 < ( f ` b ) ) -> E. x e. RR ( a < x /\ x < b /\ ( f ` x ) = 0 ) ) <-> A. b e. RR ( ( a < b /\ ( ( r e. RR |-> ( ( F ` r ) - U ) ) ` a ) < 0 /\ 0 < ( ( r e. RR |-> ( ( F ` r ) - U ) ) ` b ) ) -> E. x e. RR ( a < x /\ x < b /\ ( ( r e. RR |-> ( ( F ` r ) - U ) ) ` x ) = 0 ) ) ) )
81	80	ralbidv 2532	. . . . . . . . 9 |- ( f = ( r e. RR |-> ( ( F ` r ) - U ) ) -> ( A. a e. RR A. b e. RR ( ( a < b /\ ( f ` a ) < 0 /\ 0 < ( f ` b ) ) -> E. x e. RR ( a < x /\ x < b /\ ( f ` x ) = 0 ) ) <-> A. a e. RR A. b e. RR ( ( a < b /\ ( ( r e. RR |-> ( ( F ` r ) - U ) ) ` a ) < 0 /\ 0 < ( ( r e. RR |-> ( ( F ` r ) - U ) ) ` b ) ) -> E. x e. RR ( a < x /\ x < b /\ ( ( r e. RR |-> ( ( F ` r ) - U ) ) ` x ) = 0 ) ) ) )
82	69, 81	imbi12d 234	. . . . . . . 8 |- ( f = ( r e. RR |-> ( ( F ` r ) - U ) ) -> ( ( f e. ( RR -cn-> RR ) -> A. a e. RR A. b e. RR ( ( a < b /\ ( f ` a ) < 0 /\ 0 < ( f ` b ) ) -> E. x e. RR ( a < x /\ x < b /\ ( f ` x ) = 0 ) ) ) <-> ( ( r e. RR |-> ( ( F ` r ) - U ) ) e. ( RR -cn-> RR ) -> A. a e. RR A. b e. RR ( ( a < b /\ ( ( r e. RR |-> ( ( F ` r ) - U ) ) ` a ) < 0 /\ 0 < ( ( r e. RR |-> ( ( F ` r ) - U ) ) ` b ) ) -> E. x e. RR ( a < x /\ x < b /\ ( ( r e. RR |-> ( ( F ` r ) - U ) ) ` x ) = 0 ) ) ) ) )
83	68, 82	spcv 2900	. . . . . . 7 |- ( A. f ( f e. ( RR -cn-> RR ) -> A. a e. RR A. b e. RR ( ( a < b /\ ( f ` a ) < 0 /\ 0 < ( f ` b ) ) -> E. x e. RR ( a < x /\ x < b /\ ( f ` x ) = 0 ) ) ) -> ( ( r e. RR |-> ( ( F ` r ) - U ) ) e. ( RR -cn-> RR ) -> A. a e. RR A. b e. RR ( ( a < b /\ ( ( r e. RR |-> ( ( F ` r ) - U ) ) ` a ) < 0 /\ 0 < ( ( r e. RR |-> ( ( F ` r ) - U ) ) ` b ) ) -> E. x e. RR ( a < x /\ x < b /\ ( ( r e. RR |-> ( ( F ` r ) - U ) ) ` x ) = 0 ) ) ) )
84	66, 83	syl 14	. . . . . 6 |- ( ph -> ( ( r e. RR |-> ( ( F ` r ) - U ) ) e. ( RR -cn-> RR ) -> A. a e. RR A. b e. RR ( ( a < b /\ ( ( r e. RR |-> ( ( F ` r ) - U ) ) ` a ) < 0 /\ 0 < ( ( r e. RR |-> ( ( F ` r ) - U ) ) ` b ) ) -> E. x e. RR ( a < x /\ x < b /\ ( ( r e. RR |-> ( ( F ` r ) - U ) ) ` x ) = 0 ) ) ) )
85	65, 84	mpd 13	. . . . 5 |- ( ph -> A. a e. RR A. b e. RR ( ( a < b /\ ( ( r e. RR |-> ( ( F ` r ) - U ) ) ` a ) < 0 /\ 0 < ( ( r e. RR |-> ( ( F ` r ) - U ) ) ` b ) ) -> E. x e. RR ( a < x /\ x < b /\ ( ( r e. RR |-> ( ( F ` r ) - U ) ) ` x ) = 0 ) ) )
86	45, 85, 5	rspcdva 2915	. . . 4 |- ( ph -> A. b e. RR ( ( A < b /\ ( ( r e. RR |-> ( ( F ` r ) - U ) ) ` A ) < 0 /\ 0 < ( ( r e. RR |-> ( ( F ` r ) - U ) ) ` b ) ) -> E. x e. RR ( A < x /\ x < b /\ ( ( r e. RR |-> ( ( F ` r ) - U ) ) ` x ) = 0 ) ) )
87	36, 86, 19	rspcdva 2915	. . 3 |- ( ph -> ( ( A < B /\ ( ( r e. RR |-> ( ( F ` r ) - U ) ) ` A ) < 0 /\ 0 < ( ( r e. RR |-> ( ( F ` r ) - U ) ) ` B ) ) -> E. x e. RR ( A < x /\ x < B /\ ( ( r e. RR |-> ( ( F ` r ) - U ) ) ` x ) = 0 ) ) )
88	28, 87	mpd 13	. 2 |- ( ph -> E. x e. RR ( A < x /\ x < B /\ ( ( r e. RR |-> ( ( F ` r ) - U ) ) ` x ) = 0 ) )
89	5	adantr 276	. . . . . 6 |- ( ( ph /\ ( x e. RR /\ ( A < x /\ x < B /\ ( ( r e. RR |-> ( ( F ` r ) - U ) ) ` x ) = 0 ) ) ) -> A e. RR )
90	89	rexrd 8229	. . . . 5 |- ( ( ph /\ ( x e. RR /\ ( A < x /\ x < B /\ ( ( r e. RR |-> ( ( F ` r ) - U ) ) ` x ) = 0 ) ) ) -> A e. RR* )
91	19	adantr 276	. . . . . 6 |- ( ( ph /\ ( x e. RR /\ ( A < x /\ x < B /\ ( ( r e. RR |-> ( ( F ` r ) - U ) ) ` x ) = 0 ) ) ) -> B e. RR )
92	91	rexrd 8229	. . . . 5 |- ( ( ph /\ ( x e. RR /\ ( A < x /\ x < B /\ ( ( r e. RR |-> ( ( F ` r ) - U ) ) ` x ) = 0 ) ) ) -> B e. RR* )
93		simprl 531	. . . . 5 |- ( ( ph /\ ( x e. RR /\ ( A < x /\ x < B /\ ( ( r e. RR |-> ( ( F ` r ) - U ) ) ` x ) = 0 ) ) ) -> x e. RR )
94	90, 92, 93	3jca 1203	. . . 4 |- ( ( ph /\ ( x e. RR /\ ( A < x /\ x < B /\ ( ( r e. RR |-> ( ( F ` r ) - U ) ) ` x ) = 0 ) ) ) -> ( A e. RR* /\ B e. RR* /\ x e. RR ) )
95		simprr1 1071	. . . . 5 |- ( ( ph /\ ( x e. RR /\ ( A < x /\ x < B /\ ( ( r e. RR |-> ( ( F ` r ) - U ) ) ` x ) = 0 ) ) ) -> A < x )
96		simprr2 1072	. . . . 5 |- ( ( ph /\ ( x e. RR /\ ( A < x /\ x < B /\ ( ( r e. RR |-> ( ( F ` r ) - U ) ) ` x ) = 0 ) ) ) -> x < B )
97	95, 96	jca 306	. . . 4 |- ( ( ph /\ ( x e. RR /\ ( A < x /\ x < B /\ ( ( r e. RR |-> ( ( F ` r ) - U ) ) ` x ) = 0 ) ) ) -> ( A < x /\ x < B ) )
98		elioo4g 10169	. . . 4 |- ( x e. ( A (,) B ) <-> ( ( A e. RR* /\ B e. RR* /\ x e. RR ) /\ ( A < x /\ x < B ) ) )
99	94, 97, 98	sylanbrc 417	. . 3 |- ( ( ph /\ ( x e. RR /\ ( A < x /\ x < B /\ ( ( r e. RR |-> ( ( F ` r ) - U ) ) ` x ) = 0 ) ) ) -> x e. ( A (,) B ) )
100	8	adantr 276	. . . . . 6 |- ( ( ph /\ ( x e. RR /\ ( A < x /\ x < B /\ ( ( r e. RR |-> ( ( F ` r ) - U ) ) ` x ) = 0 ) ) ) -> F : RR --> RR )
101	100, 93	ffvelcdmd 5783	. . . . 5 |- ( ( ph /\ ( x e. RR /\ ( A < x /\ x < B /\ ( ( r e. RR |-> ( ( F ` r ) - U ) ) ` x ) = 0 ) ) ) -> ( F ` x ) e. RR )
102	101	recnd 8208	. . . 4 |- ( ( ph /\ ( x e. RR /\ ( A < x /\ x < B /\ ( ( r e. RR |-> ( ( F ` r ) - U ) ) ` x ) = 0 ) ) ) -> ( F ` x ) e. CC )
103	58	adantr 276	. . . 4 |- ( ( ph /\ ( x e. RR /\ ( A < x /\ x < B /\ ( ( r e. RR |-> ( ( F ` r ) - U ) ) ` x ) = 0 ) ) ) -> U e. CC )
104		fveq2 5639	. . . . . . 7 |- ( r = x -> ( F ` r ) = ( F ` x ) )
105	104	oveq1d 6033	. . . . . 6 |- ( r = x -> ( ( F ` r ) - U ) = ( ( F ` x ) - U ) )
106	10	adantr 276	. . . . . . 7 |- ( ( ph /\ ( x e. RR /\ ( A < x /\ x < B /\ ( ( r e. RR |-> ( ( F ` r ) - U ) ) ` x ) = 0 ) ) ) -> U e. RR )
107	101, 106	resubcld 8560	. . . . . 6 |- ( ( ph /\ ( x e. RR /\ ( A < x /\ x < B /\ ( ( r e. RR |-> ( ( F ` r ) - U ) ) ` x ) = 0 ) ) ) -> ( ( F ` x ) - U ) e. RR )
108	2, 105, 93, 107	fvmptd3 5740	. . . . 5 |- ( ( ph /\ ( x e. RR /\ ( A < x /\ x < B /\ ( ( r e. RR |-> ( ( F ` r ) - U ) ) ` x ) = 0 ) ) ) -> ( ( r e. RR |-> ( ( F ` r ) - U ) ) ` x ) = ( ( F ` x ) - U ) )
109		simprr3 1073	. . . . 5 |- ( ( ph /\ ( x e. RR /\ ( A < x /\ x < B /\ ( ( r e. RR |-> ( ( F ` r ) - U ) ) ` x ) = 0 ) ) ) -> ( ( r e. RR |-> ( ( F ` r ) - U ) ) ` x ) = 0 )
110	108, 109	eqtr3d 2266	. . . 4 |- ( ( ph /\ ( x e. RR /\ ( A < x /\ x < B /\ ( ( r e. RR |-> ( ( F ` r ) - U ) ) ` x ) = 0 ) ) ) -> ( ( F ` x ) - U ) = 0 )
111	102, 103, 110	subeq0d 8498	. . 3 |- ( ( ph /\ ( x e. RR /\ ( A < x /\ x < B /\ ( ( r e. RR |-> ( ( F ` r ) - U ) ) ` x ) = 0 ) ) ) -> ( F ` x ) = U )
112		fveqeq2 5648	. . . 4 |- ( c = x -> ( ( F ` c ) = U <-> ( F ` x ) = U ) )
113	112	rspcev 2910	. . 3 |- ( ( x e. ( A (,) B ) /\ ( F ` x ) = U ) -> E. c e. ( A (,) B ) ( F ` c ) = U )
114	99, 111, 113	syl2anc 411	. 2 |- ( ( ph /\ ( x e. RR /\ ( A < x /\ x < B /\ ( ( r e. RR |-> ( ( F ` r ) - U ) ) ` x ) = 0 ) ) ) -> E. c e. ( A (,) B ) ( F ` c ) = U )
115	88, 114	rexlimddv 2655	1 |- ( ph -> E. c e. ( A (,) B ) ( F ` c ) = U )

Syntax hints:   -> wi 4   /\ wa 104   <-> wb 105   /\ w3a 1004   A.wal 1395   = wceq 1397   e. wcel 2202   A.wral 2510   E.wrex 2511   C_ wss 3200   class class class wbr 4088   |-> cmpt 4150   -->wf 5322   ` cfv 5326  (class class class)co 6018   CCcc 8030   RRcr 8031   0cc0 8032   RR*cxr 8213   < clt 8214   - cmin 8350   (,)cioo 10123   -cn->ccncf 15297

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 716  ax-5 1495  ax-7 1496  ax-gen 1497  ax-ie1 1541  ax-ie2 1542  ax-8 1552  ax-10 1553  ax-11 1554  ax-i12 1555  ax-bndl 1557  ax-4 1558  ax-17 1574  ax-i9 1578  ax-ial 1582  ax-i5r 1583  ax-13 2204  ax-14 2205  ax-ext 2213  ax-coll 4204  ax-sep 4207  ax-nul 4215  ax-pow 4264  ax-pr 4299  ax-un 4530  ax-setind 4635  ax-iinf 4686  ax-cnex 8123  ax-resscn 8124  ax-1cn 8125  ax-1re 8126  ax-icn 8127  ax-addcl 8128  ax-addrcl 8129  ax-mulcl 8130  ax-mulrcl 8131  ax-addcom 8132  ax-mulcom 8133  ax-addass 8134  ax-mulass 8135  ax-distr 8136  ax-i2m1 8137  ax-0lt1 8138  ax-1rid 8139  ax-0id 8140  ax-rnegex 8141  ax-precex 8142  ax-cnre 8143  ax-pre-ltirr 8144  ax-pre-ltwlin 8145  ax-pre-lttrn 8146  ax-pre-apti 8147  ax-pre-ltadd 8148  ax-pre-mulgt0 8149  ax-pre-mulext 8150  ax-arch 8151  ax-caucvg 8152

This theorem depends on definitions:  df-bi 117  df-stab 838  df-dc 842  df-3or 1005  df-3an 1006  df-tru 1400  df-fal 1403  df-nf 1509  df-sb 1811  df-eu 2082  df-mo 2083  df-clab 2218  df-cleq 2224  df-clel 2227  df-nfc 2363  df-ne 2403  df-nel 2498  df-ral 2515  df-rex 2516  df-reu 2517  df-rmo 2518  df-rab 2519  df-v 2804  df-sbc 3032  df-csb 3128  df-dif 3202  df-un 3204  df-in 3206  df-ss 3213  df-nul 3495  df-if 3606  df-pw 3654  df-sn 3675  df-pr 3676  df-op 3678  df-uni 3894  df-int 3929  df-iun 3972  df-br 4089  df-opab 4151  df-mpt 4152  df-tr 4188  df-id 4390  df-po 4393  df-iso 4394  df-iord 4463  df-on 4465  df-ilim 4466  df-suc 4468  df-iom 4689  df-xp 4731  df-rel 4732  df-cnv 4733  df-co 4734  df-dm 4735  df-rn 4736  df-res 4737  df-ima 4738  df-iota 5286  df-fun 5328  df-fn 5329  df-f 5330  df-f1 5331  df-fo 5332  df-f1o 5333  df-fv 5334  df-isom 5335  df-riota 5971  df-ov 6021  df-oprab 6022  df-mpo 6023  df-1st 6303  df-2nd 6304  df-recs 6471  df-frec 6557  df-map 6819  df-sup 7183  df-inf 7184  df-pnf 8216  df-mnf 8217  df-xr 8218  df-ltxr 8219  df-le 8220  df-sub 8352  df-neg 8353  df-reap 8755  df-ap 8762  df-div 8853  df-inn 9144  df-2 9202  df-3 9203  df-4 9204  df-n0 9403  df-z 9480  df-uz 9756  df-q 9854  df-rp 9889  df-xneg 10007  df-xadd 10008  df-ioo 10127  df-seqfrec 10711  df-exp 10802  df-cj 11404  df-re 11405  df-im 11406  df-rsqrt 11560  df-abs 11561  df-rest 13326  df-topgen 13345  df-psmet 14560  df-xmet 14561  df-met 14562  df-bl 14563  df-mopn 14564  df-top 14725  df-topon 14738  df-bases 14770  df-cn 14915  df-cnp 14916  df-tx 14980  df-cncf 15298

This theorem is referenced by:  ivthdichlem  15378