Vereinfachen Sie die folgenden Teilmengen der reellen Zahlen.:
a) ]1,3[ U ]3,4[ U (ℕ ∩ [1,3])
b) ([0,3] \ [0,2]) \ [1,2],
c) [0,3] \ ([0,2] \ [1,2])
d) {x ∈ ℝ | x² ≥ 1} ∩ {x ∈ ℝ | x < 0}
Stimmen meine Lösungen?
a) ]1,3[ U ]3,4[ U (N ∩ [1,3]) = ]1,3[ U ]3,4[ ∩ N U [1,3] = ]1,3[ U ]3,4[ ∩ N = ]1,3[ U ]3,4[ ∩ [0, infty[
= ]1,3[ ∩ [0, infty[ U ]3,4[ ∩ [0, infty[ = {2} U {} = {2} ?
b) = {3}
c) = {3}
d) = x ∈ R, x<=-1 also ]-infty,-1]