Skip main navigation

Logical equivalence: De Morgan’s law

In this video, York student Salomé shows how we can test for logical equivalence using a truth-table, demonstrating De Morgan's law.

This video gives an example of testing for logical equivalence using a truth-table. In this case, we show that ‘(P & Q)’ is logically equivalent to ‘~(~P (vee) ~Q)’. This equivalence is called De Morgan’s Law.

This article is from the free online

Logic: The Language of Truth

Created by
FutureLearn - Learning For Life

Reach your personal and professional goals

Unlock access to hundreds of expert online courses and degrees from top universities and educators to gain accredited qualifications and professional CV-building certificates.

Join over 18 million learners to launch, switch or build upon your career, all at your own pace, across a wide range of topic areas.

Start Learning now