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Gilbert Strang, Calculus, 3rd edition (Wellesley-Cambridge Press; MIT OpenCourseWare RES.18-001) §2.6 Limits, #3 · Calculus · Limits

(d) … is a necessary condition for

Which of these statements are equivalent to $B \Rightarrow A$ ?

(a) If $A$ is true so is $B$

(b) $A$ is true if and only if $B$ is true

(c) $B$ is a sufficient condition for $A$

(d) $A$ is a necessary condition for $B$ .

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Gilbert Strang, Calculus, 3rd edition (Wellesley-Cambridge Press; MIT OpenCourseWare RES.18-001) · §2.6 Limits, #3

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