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A (and) B
 conjunction
 both have to be T to be T

A v B
 disjunction
 both have to be F to be F

A (side ways u) B
if A then B

A (three lines) B
A if and only if B
 biconditional
 have to be the same to be T

Vaild because
every valuation with true premises has a true conclusion

invalid because
every valuation with true premises does not have true conclusions

