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Jun 25, 2013 at 3:02 review Late answers
Jun 26, 2013 at 10:56
Feb 4, 2013 at 5:54 comment added Alexandre Eremenko Matti, it is interesting to know that they have a name. Do you know why Lambert? Lambert was an XVIII century mathematician who is remembered for Lambert series. Why is his name attached to these quadrilaterals? (Unless there was some other Lambert).
Feb 3, 2013 at 6:28 history answered Matti Vuorinen CC BY-SA 3.0