Top network posts

• 100 How does Cramer's rule work?
• 44 Absolute value inequality for complex numbers
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• 23 Has any error ever been found in Euclid's elements?
• 22 Proving ${\sum_{n=1}^\infty {1\over F_n}} <4$
• 20 Why is Axiom of Choice required for the proof of countable union of countable sets is countable?
• 17 Why did nobody prove undecidability by the "too many problems" argument?
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