Logical operators

Examples:

F ; T

## [1] FALSE

## [1] TRUE

!TRUE    # not TRUE == FALSE  

## [1] FALSE

TRUE & TRUE

## [1] TRUE

FALSE & FALSE

## [1] FALSE

TRUE & FALSE   # returns TRUE if both expressions are TRUE

## [1] FALSE

TRUE | FALSE   # returns TRUE if at least one of the two expressions is TRUE

## [1] TRUE