If you disregard the very simplest cases, there is in all of mathematics not a single infinite series whose sum has been rigorously determined. In other words,the most important parts of mathematics stand without a foundation.
More Quotes from Niels H. Abel:
A reply to a question about how he got his expertise By studying the masters and not their pupils.Niels H. Abel
About Gauss' mathematical writing style He is like the fox, who effaces his tracks in the sand with his tail.
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