Theorem lenelioc 39763

Description: A real number smaller than or equal to the lower bound of a left open right closed interval is not an element of the interval. (Contributed by Glauco Siliprandi, 3-Jan-2021.)

Hypotheses

Ref	Expression
lenelioc.1	|- ( ph -> A e. RR* )
lenelioc.2	|- ( ph -> B e. RR* )
lenelioc.3	|- ( ph -> C e. RR* )
lenelioc.4	|- ( ph -> C <_ A )

Assertion

Ref	Expression
lenelioc	|- ( ph -> -. C e. ( A (,] B ) )

Proof of Theorem lenelioc

Step	Hyp	Ref	Expression
1		lenelioc.4	. . . 4 |- ( ph -> C <_ A )
2		lenelioc.3	. . . . 5 |- ( ph -> C e. RR* )
3		lenelioc.1	. . . . 5 |- ( ph -> A e. RR* )
4	2, 3	xrlenltd 10104	. . . 4 |- ( ph -> ( C <_ A <-> -. A < C ) )
5	1, 4	mpbid 222	. . 3 |- ( ph -> -. A < C )
6	5	intn3an2d 1443	. 2 |- ( ph -> -. ( C e. RR* /\ A < C /\ C <_ B ) )
7		lenelioc.2	. . 3 |- ( ph -> B e. RR* )
8		elioc1 12217	. . 3 |- ( ( A e. RR* /\ B e. RR* ) -> ( C e. ( A (,] B ) <-> ( C e. RR* /\ A < C /\ C <_ B ) ) )
9	3, 7, 8	syl2anc 693	. 2 |- ( ph -> ( C e. ( A (,] B ) <-> ( C e. RR* /\ A < C /\ C <_ B ) ) )
10	6, 9	mtbird 315	1 |- ( ph -> -. C e. ( A (,] B ) )

Syntax hints:   -. wn 3   -> wi 4   <-> wb 196   /\ w3a 1037   e. wcel 1990   class class class wbr 4653  (class class class)co 6650   RR*cxr 10073   < clt 10074   <_ cle 10075   (,]cioc 12176

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1722  ax-4 1737  ax-5 1839  ax-6 1888  ax-7 1935  ax-8 1992  ax-9 1999  ax-10 2019  ax-11 2034  ax-12 2047  ax-13 2246  ax-ext 2602  ax-sep 4781  ax-nul 4789  ax-pr 4906  ax-un 6949  ax-cnex 9992  ax-resscn 9993

This theorem depends on definitions:  df-bi 197  df-or 385  df-an 386  df-3an 1039  df-tru 1486  df-ex 1705  df-nf 1710  df-sb 1881  df-eu 2474  df-mo 2475  df-clab 2609  df-cleq 2615  df-clel 2618  df-nfc 2753  df-ral 2917  df-rex 2918  df-rab 2921  df-v 3202  df-sbc 3436  df-dif 3577  df-un 3579  df-in 3581  df-ss 3588  df-nul 3916  df-if 4087  df-sn 4178  df-pr 4180  df-op 4184  df-uni 4437  df-br 4654  df-opab 4713  df-id 5024  df-xp 5120  df-rel 5121  df-cnv 5122  df-co 5123  df-dm 5124  df-iota 5851  df-fun 5890  df-fv 5896  df-ov 6653  df-oprab 6654  df-mpt2 6655  df-xr 10078  df-le 10080  df-ioc 12180

This theorem is referenced by: (None)