Confused with sufficient and necessary condition

Thread starter annoymage
Start date Sep 19, 2010
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Condition Confused

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The discussion centers on the distinction between necessary and sufficient conditions in logic. It clarifies that "A is necessary for B" means that if B is true, then A must also be true, which is expressed as "B implies A." However, confusion arises with the phrase "A is necessary of B," which is not a standard expression in logical terminology. Participants seek clarification on the correct usage and implications of these terms. Understanding these concepts is crucial for accurately interpreting logical statements.

Sep 19, 2010

annoymage

Homework Statement

i know that "A is necessary for B" means "B implies A".

but i confused with the word "A is necessary of B" somebody help

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Sep 19, 2010

Mark44

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annoymage said:

Homework Statement

i know that "A is necessary for B" means "B implies A".

but i confused with the word "A is necessary of B" somebody help

Take a look here.

Thread 'Distance between a Clock's hands when the distance is increasing most rapidly'

Question: A clock's minute hand has length 4 and its hour hand has length 3. What is the distance between the tips at the moment when it is increasing most rapidly?(Putnam Exam Question) Answer: Making assumption that both the hands moves at constant angular velocities, the answer is ## \sqrt{7} .## But don't you think this assumption is somewhat doubtful and wrong?

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