
Logik
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Mathematics
University
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8 questions
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1.
MULTIPLE CHOICE QUESTION
45 sec • 1 pt
Welches ist keine Aussage?
2 ist irrational
Für alle reellen Zahlen r gilt r + 1 > r
Morgen gehe ich in die Schule.
x ist teilbar durch 2
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
"Für alle" in Symbolen ist:
∈
∀
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
∈ bedeutet
"Element von"
"Teilmenge von"
"Es existiert"
4.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
Die Negation von ∀x∈X ∃y∈Y : A(x,y) ist...
∃x∈X ∀y∈Y : nicht A(x,y)
∀x∈X ∃y∈Y : nicht A(x,y)
∃x∈X ∃y∈Y : A(x,y)
5.
MULTIPLE SELECT QUESTION
1 min • 1 pt
"A ⇒ B" sei wahr. Was ist sicher, immer falsch? (Multiple choice)
A wahr, B wahr
A wahr, B falsch
A falsch, B wahr
A falsch, B falsch
6.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
Sei R eine Relation auf der leeren Menge X = {}. Ist sie reflexiv?
Ja
Nein
7.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
Man muss zeigen, dass kein x∈X existiert mit einer Eigenschaft A(x). Welche (vielleicht äquivalente) Aussage muss man zeigen?
∀x∈X: A(x)
∃x∈X: A(x)
∀x∈X: nicht A(x)
∃x∈X: nicht A(x)
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