Negate the following expression and select the best answer below: A = for all; E = for some.*
Question
Negate the following expression and select the best answer below:
A = for all;
E = for some.
Solution
To negate the given expression using logical quantifiers, let's break down the problem as follows:
1. Break Down the Problem
- The original expression involves two quantifiers:
- "A" represents "for all" (universal quantifier).
- "E" represents "for some" (existential quantifier).
- We need to determine the negation of a statement involving these quantifiers.
2. Relevant Concepts
- The negation of a universal quantifier can be expressed as an existential quantifier:
- The negation of an existential quantifier can be expressed as a universal quantifier:
3. Analysis and Detail
-
If we assume the expression is something like (for all x, P holds), its negation would be:
- (there exists at least one x for which P does not hold).
-
If the expression is something like (there exists at least one x such that P holds), its negation would be:
- (for all x, P does not hold).
4. Verify and Summarize
- To summarize:
- Negating "for all" results in "for some not."
- Negating "for some" results in "for all not."
Final Answer
The negation of an expression using these quantifiers can generally be expressed as follows:
- Negation of is
- Negation of is
Select the appropriate negated expression based on the context provided.
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