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### Questions (95)

 102 Logic puzzle: Which octopus is telling the truth? 5 Order of the group of integer orthogonal matrices 5 infinitely descending natural numbers 4 Prove that the set consisting of isolated points is finite. 4 How do I find $\|T\|$ when given a matrix $T$?

### Reputation (2,185)

 +10 Order of the group of integer orthogonal matrices +40 Logic puzzle: Which octopus is telling the truth? +10 Investigate whether there exists a function $f : [a,b]\rightarrow R$ that is continuous and that takes exactly twice each of its values. +10 For a finite set in $\mathbb{R}$, the interior is empty and the closure and boundary are the set itself

 0 $v(t) = \int_{t_0}^t u(\tau) \mathop{d\tau}$ is weakly differentiable 0 any pattern here ? (revised 2)

### Tags (43)

 0 analysis × 24 0 calculus × 5 0 elementary-number-theory × 21 0 matrices × 4 0 linear-algebra × 21 0 complex-analysis × 4 0 real-analysis × 7 0 abstract-algebra × 3 0 functional-analysis × 6 0 vector-spaces × 3