Le Chifre

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315 reputation

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	location	Vienna
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visits	member for	10 months
	seen	Apr 26 at 6:59
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23 Questions

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5	Is it viable to ask in an infinite set about the Cardinality?
4	Whats wrong with my matrix calculations?
3	How to solve this linear equations?
2	Why is $\sum x^2 _t \times \text{Var}(\beta)=\frac{\sum x^2 _t \times \sigma^2}{ \sum x^2 _t} = \sigma^2$?
1	How to effectively calculate $(1/\sqrt1 + \sqrt2) + (1/\sqrt2 + \sqrt3) +\cdots + (1/\sqrt{99} + \sqrt{100})$ [duplicate]

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315 Reputation

+5	Is the square for a number $n\in \mathbb{Z}$ even, then is also $n$ even - prove this via contraposition?
+10	Why is $\sum x^2 _t \times \text{Var}(\beta)=\frac{\sum x^2 _t \times \sigma^2}{ \sum x^2 _t} = \sigma^2$?
+8	How to effectively calculate $(1/\sqrt1 + \sqrt2) + (1/\sqrt2 + \sqrt3) +\cdots + (1/\sqrt{99} + \sqrt{100})$
+5	How to solve this matrix?

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3 Answers

votes activity newest

5	Can you provide me historical examples of pure mathematics becoming “useful”?
1	Real life coordinate geometry problem
1	How is each factor of an expression called?

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1 geometry	0 matrices × 7
1 algebra-precalculus	0 statistics × 6
1 convention	0 probability × 4

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