Theorem dcstab 844

Description: Decidability implies stability. The converse need not hold. (Contributed by David A. Wheeler, 13-Aug-2018.)

Assertion

Ref	Expression
dcstab	|- (DECID ph -> STAB ph )

Proof of Theorem dcstab

Step	Hyp	Ref	Expression
1		notnotrdc 843	. 2 |- (DECID ph -> ( -. -. ph -> ph ) )
2		df-stab 831	. 2 |- (STAB ph <-> ( -. -. ph -> ph ) )
3	1, 2	sylibr 134	1 |- (DECID ph -> STAB ph )

Syntax hints:   -. wn 3   -> wi 4  STAB wstab 830  DECID wdc 834

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-in2 615  ax-io 709

This theorem depends on definitions:  df-bi 117  df-stab 831  df-dc 835

This theorem is referenced by:  stdcndc  845  stdcndcOLD  846  condc  853  imandc  889  sbthlemi3  6957