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In case it interests anyone, first, the zig-zag product of a 4-regular graph and of a 1-regular graph, detailed in four steps:

Then the less trivial zig-zag product of a 4-regular graph and of a 2-regular graph, in the four same steps:

Finally, a schema with the principle (same notation as in the formulas):

Hey! There is something wrong with the definition given in the article. For example ROT_H(a,i) is not defined! Surely it should be ROT_H(a,j)!! I have not checked the rest of the definition. — Preceding unsigned comment added by 142.58.10.135 ( talk) 01:43, 12 December 2015 (UTC) reply

Best, -- MathsPoetry ( talk) 16:56, 3 July 2013 (UTC) reply

I think the schema illustration, at least, would be a very helpful addition to the article. — David Eppstein ( talk) 22:19, 4 July 2013 (UTC) reply

Thank you for this mark of appreciation, David. -- MathsPoetry ( talk) 00:20, 5 July 2013 (UTC) reply