Certain topics in this chapter are included to demonstrate the beauty, which some people, even scientists, fail to find in mathematics. How many people really care whether or not the number e is irrational? After all, in performing everyday calculations, this number of royalty is cruelly stripped of most of its digits and is treated like a common rational number. Yet, no true researcher can stay indifferent in front of this amazingly simple yet brilliant proof of Theorem 10.1.1.
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