Aufgabe2

a)

$P(M)= \{ \emptyset , \{a,b,c,d\}, \{a,b,c\},\{a,b,d\},\{b,c,d\},\{c,d,a\},\\ \{a,b\},\{a,c\},\{a,d\},\{b,c\},\{b,d\},\{c,d\}, \{a\},\{b\},\{c\},\{d\}\}$

b)

$P(M)=\{\{a\}, \emptyset \}$

c)

$P(M)=\{\emptyset\}$

d)

$P(M)=\{\emptyset , \{\emptyset\}\}$