I need help understanding the line above the A, I've sometimes seen it written as A'. I do not know what it means or how to arrive at this conclusion, please explain. P.s. the exercise i'm talking about is the (f) on the first image (g) in the second EXERCISE SET 1.2 In Exercises 1 through 4, let U={a,b,c,d,e,f, g,h,k},A={a,b,c,g},B={d,e,f,g},C= { solutionspile.com

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I need help understanding the line above the A, I've sometimes seen it written as A'. I do not know what it means or how to arrive at this conclusion, please explain.

P.s. the exercise i'm talking about is the (f) on the first image (g) in the second

EXERCISE SET 1.2 In Exercises 1 through 4, let

U = {a, b, c, d, e, f

,

g, h, k}, A = {a, b, c, g}, B = {d, e, f, g}, C =

{a, c, f}

, and

D = {f, h, k}

. 1. Compute (a)

A ? B

(b)

B ? C

(d)

B ? D

(e)

A ? B

(c)

A ? C

(g)

A ? B

(h)

A ? C

(f)

\overset{?}{A}

We need to compute

\overset{?}{A}

if

U = {a, b, c, d, e, f, g, h, k}

and

A = {a, b, c, g}

. We know that if

U

is a universal set containing

A

, then

\overset{?}{A} = U ? A

. Therefore,

\overset{?}{A} = {d, e, f, h, k}

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