Handout 1 question 5

Handouts and Homeworks
1

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in handout 1 question 5 I didnt understand the part marked in yellow brackets .
it’s not so clear what the function pie does and how we conclude it is the same size as P(B)

2

for example: \pi(\{x,y,z\})=\{y,z\}

3

I still didn’t undestand why |Px|=|P(b)|