necessary and sufficient conditions Flashcards

1
Q

necessary conditions

A

x is a necessary condition for y if the presence of x is required for the presence of y
something you need in order to have something
eg you cant have rain without water

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2
Q

however water doesn’t guarantee rain hence water is necessary but not sufficient condition for rain

A

sufficient conditions is when a condition is met an effect is guaranteed
eg, being an aunt guarantees relatives but it is not necessary to be an aunt to have relatives

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3
Q

some conditions are both necessary and jointly sufficient.

A

x and y are sufficient conditions for z if the presence of x and y guarantees the presence of z
never been married and being a man are necessary and jointly sufficient conditions for being a bachelor.
you can not be a bachelor if the conditions are met, both conditions need to be met.

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4
Q

justified true belief definition of knowledge

A

saying that all three conditions are necessary and jointly sufficient to have knowledge

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