4. "when," written with the symbol. ↔The value of truth, which contains linear praphot with "when" (p ↔ q) has.Is true when p and q have the same truth value. (This is false when p and q are different truth values).
4. "when" wrote wildcards. ↔ the truth of any proposition composites by "when" (p↔q) is a true fact, when p and q are virtually the same (false when p and q values. real difference)
4. "When," wrote symbol. ↔.The truth value of the proposition of any assembly welding. "When" (P ↔ q) will have a value.As a true and when p q is the truth.(a false, when p q values and truths).