(P279)	(Q11348)
(P1269)	(Q200694)
(P1889)	(Q1372900) (Q5508846)

External Links

(P646)	/m/019bpb
(P1417)	topic/propositional-function
(P3123)	propositional-function
(P3827)	propositional-functions
(P6366)	2777350767
(P7554)	Propositional_function