Určete, které z následujících výroků jsou tautologií (= vždy pravdivý složený výrok):
\( \large \left( a \Leftrightarrow b\right) \Rightarrow \left( \neg a \Rightarrow \neg b\right) \)
a⇔b
¬a⇒¬b
(a⇒b)⇒(¬a⇒¬b)
1
1
0
0
1
0
Unchecked
a⇔b
¬a⇒¬b
(a⇔¬b)⇒(¬a⇒¬b)
1
1
0
0
1
1
Unchecked
a⇔b
¬a⇒¬b
(a⇔b)⇒(¬a⇒¬b)
1
1
1
0
1
1
Unchecked
a⇔b
¬a⇒¬b
(a⇔b)⇒(¬a⇒b)
1
1
0
0
1
0
Unchecked
Hint
Hint
Máš za úkol určit, zda tato implikace ekvivalence a implikace je tautologií, tedy jestli je vždy pravdivá.
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