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Fixed Expressions | Definition & Examples

Recall the definition of a valid expression for the proof checker. Any single letter A-Z or a-z is a valid expression. If E is a valid expression, then:o(E) is a valid expressiono(Ec) is a valid expressionIf E and E' are valid expressions, then:o(E ∩ E') is a valid expressiono(E ∪ E') is a valid expressiono(E ∩ E) is a valid expressiono(E ∪ E) is a valid expressionBased on the above definition, which of the following are valid expressions? Select all that apply:(a) ((A ∪ a) ∩ (B ∪

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