Theorem reapirr 8756

Description: Real apartness is irreflexive. Part of Definition 11.2.7(v) of [HoTT], p. (varies). Beyond the development of # itself, proofs should use apirr 8784 instead. (Contributed by Jim Kingdon, 26-Jan-2020.)

Assertion

Ref	Expression
reapirr	|- ( A e. RR -> -. A #ℝ A )

Proof of Theorem reapirr

Step	Hyp	Ref	Expression
1		ltnr 8255	. 2 |- ( A e. RR -> -. A < A )
2		reapval 8755	. . . 4 |- ( ( A e. RR /\ A e. RR ) -> ( A #ℝ A <-> ( A < A \/ A < A ) ) )
3	2	anidms 397	. . 3 |- ( A e. RR -> ( A #ℝ A <-> ( A < A \/ A < A ) ) )
4		oridm 764	. . 3 |- ( ( A < A \/ A < A ) <-> A < A )
5	3, 4	bitrdi 196	. 2 |- ( A e. RR -> ( A #ℝ A <-> A < A ) )
6	1, 5	mtbird 679	1 |- ( A e. RR -> -. A #ℝ A )

Syntax hints:   -. wn 3   -> wi 4   <-> wb 105   \/ wo 715   e. wcel 2202   class class class wbr 4088   RRcr 8030   < clt 8213   #_ℝ creap 8753

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-sep 4207  ax-pow 4264  ax-pr 4299  ax-un 4530  ax-setind 4635  ax-cnex 8122  ax-resscn 8123  ax-pre-ltirr 8143

This theorem depends on definitions:  df-bi 117  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-rab 2519  df-v 2804  df-dif 3202  df-un 3204  df-in 3206  df-ss 3213  df-pw 3654  df-sn 3675  df-pr 3676  df-op 3678  df-uni 3894  df-br 4089  df-opab 4151  df-xp 4731  df-pnf 8215  df-mnf 8216  df-ltxr 8218  df-reap 8754

This theorem is referenced by:  apirr  8784