is mentioned by

Thm* x,y:. x y = 3 x = 3 y = 3	[K_or_equal_Three_2]
Thm* x,y:. x y = 3 x = 3 & y = 3	[K_and_equal_Three_2]

In prior sections: core fun 1 well fnd int 1 bool 1 union rel 1 quot 1 sqequal 1 prog 1 int 2 list 1 discrete jlc core 3 jlc list 3 jlc

Try larger context: ClassicalProps(jlc)