Abstract Algebra 8.1: External Direct Product

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We define the external direct product of a finite number of groups, do some examples, and show why up to isomorphism there are only two groups of order 4.
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The audio quality really is bad and hurts my ears.

anothernumber
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Apart from the audio quality this video is rather helpful. I am curious however why you use the notation for the direct sum? The external direct product is a cross in a circle.

theillusionzone