With reference to a specific example, this screencast demonstrates how to use a 4-variable Karnaugh map and De Morgan's laws to simplify a Boolean expression of 4 variables both into a 'sum of products' and a 'product of sums'

Karnaugh Maps SOP and POS (MathsCasts)

These MathsCasts were produced by the mathematics support centres at Swinburne University, the University of Limerick and Loughborough University. They were part of a collaborative research project to develop high quality resources and investigate the effectiveness of MathsCasts to support mathematics learning. The full set of resources are available at http://commons.swin.edu.au/s/mathscasts MathsCasts are licensed under a Creative Commons Attribution-NonCommercial-NoDerivs 3.0 Unported License

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Karnaugh Maps SOP and POS (MathsCasts)

Karnaugh Maps SOP and POS (MathsCasts)