Quote by William Lane Craig
“Two statements are logically equivalent if it is impossible for one to be true and the other false. They are either both true or both false. One of the most important logical equivalences is called contraposition. It tells us that any statement of the form “If P, then Q” is logically equivalent to “If not-Q, then not-P.” The example in the text of statements A and B is an example of contraposition.”
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William Lane Craig is an is an American Evangelical Christian apologist, theologian, and philosopher known for his contributions to the philosophy of religion, historical Jesus studies, and the philosophy of time. He is one of the most visible contemporary proponents of natural theology, often participating in debates on the existence of God. In 1979, Craig authored The Kalam Cosmological Argument, which is today the most published-on contemporary argument for theism in philosophy.
He is currently a Research Professor of Philosophy at Talbot School of Theology, Biola University. He is a fellow of the Discovery Institute's Center for Science and Culture, which is the hub of the intelligent design movement,[3] and a fellow of the International Society for Complexity, Information and Design (ISCID).[4] He is also a member of the American Philosophical Association, the American Academy of Religion, and a member and past president of both the Philosophy of Time Society and the Evangelical Philosophical Society.