Section 2.2: Problem 10 Solution
Working problems is a crucial part of learning mathematics. No one can learn... merely by poring over the definitions, theorems, and examples that are worked out in the text. One must work part of it out for oneself. To provide that opportunity is the purpose of the exercises.
James R. Munkres
Show that
Here
is a two-place predicate symbol and
is a constant symbol.
iff for every
such that
,
iff for every
such that
and for every
,
iff for every
such that
and for every
,
iff for every
,
iff for every
,
iff
.