Theorem reapirr 8868

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 8896 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 8366	. 2 |- ( A e. RR -> -. A < A )
2		reapval 8867	. . . 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 765	. . 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 680	1 |- ( A e. RR -> -. A #ℝ A )

Syntax hints:   -. wn 3   -> wi 4   <-> wb 105   \/ wo 716   e. wcel 2205   class class class wbr 4114   RRcr 8142   < clt 8324   #_ℝ creap 8865

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-sep 4233  ax-pow 4292  ax-pr 4327  ax-un 4559  ax-setind 4664  ax-cnex 8234  ax-resscn 8235  ax-pre-ltirr 8255

This theorem depends on definitions:  df-bi 117  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-rab 2531  df-v 2817  df-dif 3216  df-un 3218  df-in 3220  df-ss 3227  df-pw 3676  df-sn 3700  df-pr 3701  df-op 3703  df-uni 3920  df-br 4115  df-opab 4177  df-xp 4760  df-pnf 8326  df-mnf 8327  df-ltxr 8329  df-reap 8866

This theorem is referenced by:  apirr  8896