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Nov
27
accepted Is the empty set the only possible set for $A$ such that $A=\{x|x\not\in A\}$?
Aug
9
accepted How to test whether a set of four points can form a parallelogram
Mar
15
accepted How to find 3-order $f(x)$ if its remainders are $2x-1$ and $3x-3$ when $f(x)$ is divided by $x^2+x-2$ and $x^2+x-3$, respectively?
Mar
12
accepted What is the explicit formula for the sequence representing the number of any triangles in a triangular grid?
Mar
12
accepted What are the names in English for Alterando, Invertendo, Componendo and Dividendo?
Mar
12
accepted How to prove that we cannot see more than 3 faces of an opaque solid cube simultaneously?
Mar
11
accepted How to find the closed solution for the following recursive vector equations?
Mar
11
accepted How to prove the number of images of two mirrors inclined at $A$ is $360/A -1$
Mar
11
accepted How can we analytically know 34! equals to zero for the following C# code?
Dec
14
accepted How to prove by contradiction that there is only one circle with the given segment AB as its diameter?
Nov
8
accepted Are $A$ and $B'$ are independent events when $A$ and $B$ are independent events?
Nov
6
accepted How to solve $7200a+720b+72c=1000x+340+y<10000$?
Nov
5
accepted What is wrong with my reasoning about this conditional probability problem?
Oct
14
accepted How do we explain to students that division by a vector does not make sense?
Sep
25
accepted How can we solve this elementary school math problem without using equation or simultaneous equations?
Sep
24
accepted Is it permissible to locate the abscissa of extreme points of $y=f(x)$ by powering the function first for the sake of simplicity?
Aug
30
accepted Is there another simpler method to solve this elementary school math problem?
May
2
accepted Which point on or inside or outside the frame move in a circular trajectory?
Apr
30
accepted How to prove an odd-degree polynomial starts and ends at values of different sign?
Mar
15
accepted Is there the shortest notation for a vector obtained by projecting $\vec{A}$ onto $\vec{B}$?