Logical functions

NAME	DESCRIPTION
AND	Returns TRUE if all the conditions are TRUE
IN	Returns TRUE if the list of values being searched is in the array
ISBLANK	Returns the logical value TRUE if the value argument is a reference to an empty cell
ISEMPTY	Returns the logical value TRUE if the value argument is a reference to an empty cell
ISNUMBER	Returns the logical value TRUE if the value argument is a valid number
NOT	Changes FALSE to TRUE and TRUE to FALSE
OR	Returns TRUE if any of the arguments are TRUE and FALSE only if all arguments are FALSE
XOR	Returns a logical 'Exclusive OR' of all the arguments

Logical Operators

TITLE	OPERATORS	DESCRIPTION
AND	&&	Logical AND
OR	||	Logical OR