Question: Consider the two expressions sigma theta ( E 1 E 2 ) and sigma theta ( E 1 E 2 )

Consider the two expressions \sigma \theta (E1 E2) and \sigma \theta (E1 E2).
a. Show using an example that the two expressions are not equivalent in general.
b. Give a simple condition on the predicate \theta , which if satisfied will ensure that the two expressions
are equivalent.

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