I’m always on the lookout for non-rigorous, ‘pictorial’ explanations of abstract mathematical topics. Because ones that are good, and also mostly correct, are difficult to find. And also I am not particularly fond of learning mathematics by plodding through theorems in a book. I find that only with the appropriate picture does a particularly daunting and abstract topic come into focus. And then plodding through the theorems is actually quite easy.

I found this short, but sweet introduction to differential forms, via the Googles. It must be good, because PageRank puts it on the first page.

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