A set/collection of truth functional [[Connective|connectives]] is truth functionally complete iff the connectives in question allow us to express all truth functions. A set of truth functional connectives is complete iff for any truth function, specified by a truth table, there is a sentence that contain only the connectives in that set and has the truth table in question. A set of truth functional connectives is complete iff every truth function can be expressed as a sentence that only includes these connectives. For any truth table, there exists a sentence only involving these connectives whose truth table is the same as the given truth table