Theorem reapirr 8905

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 8933 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 8402	. 2 |- ( A e. RR -> -. A < A )
2		reapval 8904	. . . 4 |- ( ( A e. RR /\ A e. RR ) -> ( A #ℝ A <-> ( A < A \/ A < A ) ) )
3	2	anidms 401	. . 3 |- ( A e. RR -> ( A #ℝ A <-> ( A < A \/ A < A ) ) )
4		oridm 769	. . 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 684	1 |- ( A e. RR -> -. A #ℝ A )

This proof depends on syntax axioms:   -. wn 3   -> wi 4   <-> wb 105   \/ wo 720   e. wcel 2209   class class class wbr 4130   RRcr 8178   < clt 8360   #_ℝ creap 8902

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-sep 4249  ax-pow 4311  ax-pr 4346  ax-un 4578  ax-setind 4684  ax-cnex 8270  ax-resscn 8271  ax-pre-ltirr 8291

This proof depends on definitions:  df-bi 117  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-rab 2537  df-v 2823  df-dif 3222  df-un 3224  df-in 3226  df-ss 3233  df-pw 3690  df-sn 3715  df-pr 3716  df-op 3718  df-uni 3936  df-br 4131  df-opab 4193  df-xp 4780  df-pnf 8362  df-mnf 8363  df-ltxr 8365  df-reap 8903

This theorem is used by:  apirr  8933