This is the example I am going by;(adsbygoogle = window.adsbygoogle || []).push({});

X={a,b,c,d} Y={c,d} C={b,c}

P(x)={{a,b,c},{a,b,d},{a,c,d}{b,c,d}

{a,b},{a,c},{a,d},{b,c},{b,d},{c,d},

{a},{b},{c},{d},{a,b,c,d},{}}

This next part I do not understand? AUY=BUY

Code (Text):

A[sub]1[/sub]={a,c,d},{a,c},{a,d},{a}

A[sub]2[/sub]={a,b,c},{a,b,d},{a,d},{a,b,c,d}

A[sub]3[/sub]={b,c,d},{b,c},{b,d},{b} (=elements of C)

Y={c,d},{c},{d}

What I would like to understand is how she came up with A[sub]1[/sub], A[sub]2[/sub], A[sub]3[/sub], and Y?

I know they are subsets but how?

I have been tring to figure this out for 3days and I just want to get it.

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# Whats the relation?

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