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216 Answers

newest activity votes
62
Construct a function which is continuous in $[1,5]$ but not differentiable at $2, 3, 4$
18
What does matrix multiplication actually mean?
14
How to solve equation $ \dfrac{1}{2} (\sqrt{x^2-16} + \sqrt{x^2-9}) = 1$?
12
Prove that $\sum\limits_{k=1}^n \frac{1}{k^2+3k+1}$ is bounded above by $\frac{13}{20}$
12
Can there be two distinct, continuous functions that are equal at all rationals?
11
can a sum of square roots be an integer?
10
Use division instead of multiplication
10
Striking applications of integration by parts
9
Is this matrix obviously positive definite?
8
How do you get a paper to be peer reviewed
8
Given real numbers: define integers?
7
Solve $A^nx=b$ for an idempotent matrix
7
Eigenvector and its corresponding eigenvalue
7
Largest eigenvalue of a $A^T A$ matrix?
7
$1+x+x^3+x^4$ is not irreducible for any field
7
How to evaluate this determinant?
7
Mathematical induction usage
6
Why does infinite sum of Möbius $\mu = -1$ instead of $0$?
6
Sums of reciprocals
6
Finding if the equation is even or odd
6
Minimize $||Ax-b||$ but for $A$, not $x$
6
How is 3 modulo 5 = 3
6
When is a discontinuity of a real valued function removable?
6
a continuous function satisfying $f(f(f(x)))=-x$ other than $f(x)=-x$
6
Representation of this function using a single formula without conditions
5
How many times will “statement” be executed?
5
points inside square that form a triangle
5
Symmetry of function defined by integral
5
Zero = infinity
5
A function for which the Newton-Raphson method slowly converges?
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