Truth tables Flashcards
what is “and”?
^ (umgedrehtes v)
and
what is “or”?
v
v
or
what is “if-then”?
->
->
“if-then”
what is “not”
⏋
what is then and only then
<->
⏋
not
<->
then and only then
Truth table:
what are the values
0 = false
1 = true
what is a tautology?
a statement which is always true
1111
what is the statement called that is always true
tautology
what is the statement called that is always wrong?
contradiction/ absurdity
what is a contradiction/ absurdity?
a statement that is always wrong
0000
what is a contigency
a proposition that is sometimes true and sometimes false
How is a proposition called that is sometimes true and sometimes false?
contingency
when is “and” true?
when both statements are true
when is “or” true?
when one statement is true
or
when both statements are true
when is “if_then” true?
when the second statement is true
or
when the first statement is false
when is “not” true?
when the statement is false
when is “then and only then” true?
when both statements are true
or
when both statements are false
what does it mean, when two propositions have the same truth value on each line?
the propositions are logically equivalent
what does it mean, when two propositions have opposite truth values on each line ?
the propositions are contradictory