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I wrote this sequence on a napkin a few weeks ago, found I don’t even remember where — it only said “it skips over perfect squares”:     So what…

It doesn’t happen often that I come across an interesting problem on student’s homework. This one was. You take a loan for 1000$ with an interest rate of 20% per…

The geometry The simulation domain is 30×1 km, depicting a fjord. The right boundary faces the open ocean, the horizontal top boundary faces the atmosphere, the bottom is the bedrock,…