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"Obvious" is the most dangerous word in mathematics.
For the things of this world cannot be made known without a knowledge
of mathematics.
Opus Majus part 4 Distinctia Prima cap 1, 1267.
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.
In G. F. Simmons, Calculus Gems,
New York: Mcgraw Hill, Inc., 1992, p. 188
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