Second moment of Poisson distribution
I know that the second moment of Poisson distribution is equal to square of it's rate parameter, and in general it's true for other moments. i c...
20 Apr 2026 1 READS
Archive: General
Advantages and Disadvantages of the different forms of a quadratic function
My question is when sketching a graph what are the advantages and disadvantages for the following: i. Standard form ii. Factorised form iii. Vertex form M...
20 Apr 2026 1 READS
What should be the proportions of a three sided coin?
A classical coin has almost no chances of ending its course on the side when tossed. A round pencil with both ends flat has no chance of ending its course...
20 Apr 2026 1 READS
How to draw a circular 3D plot in matlab
I want to plot this function in matlab : sin(4*x)*cos(4*y) on a disk This is how i proceeded : syms x y; f=@(x,y) sin(4*x)*cos(4*y); ezmesh(f,'circ&#...
20 Apr 2026 1 READS
Finding general formula for a sequence that is not arithmetic and neither geometric progression?
I have this $$a_{n+1} = a_n + 4n - 1\qquad a_1 = 2$$ And I need to find general formula for $a_n$. This is one of the last exercises for the question rela...
20 Apr 2026 1 READS
What is the mathematical notation for rounding a given number to the nearest integer?
What is the mathematical notation for rounding a given number to the nearest integer? So like a mix between the floor and the ceiling function.
20 Apr 2026 1 READS
How to write the coset for the following quotient group
I would like to know for the following question, Let $E$ be the group of even integers and $N$ the subgroup of all multiples of 8. The cosets for the quot...
20 Apr 2026 1 READS
is "commensurability" as simple as saying a and b are rational?
I am trying to better understand commensurability. Wikipedia says: two non-zero real numbers a and b are said to be commensurable if $\frac{a}{b}$ is a ra...
20 Apr 2026 1 READS
Why is the domain of a composition of functions an intersection and not a union?
I'm studying the composition of functions from the University of Toronto Pre-calculus website. The instructions for determining the domain of a compo...
20 Apr 2026 1 READS
Finding the area of a triangle when only a the shaded part and two sides are known
I tried finding the height of the shaded triangle, which I calculated to be 5. Then I tried solving for the area of the non-shaded triangle, and I got 10 ...
20 Apr 2026 1 READS
