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Frentos
  • Member for 6 years, 5 months
  • Last seen more than a month ago
  • Australia
16 votes

Are proofs by contradiction really logical?

6 votes

Find $x,y,z>0$ such that $x+y+z=1$ and $x^2+y^2+z^2$ is minimal

5 votes
Accepted

adding rows together linear algebra

4 votes

In how many ways can a $31$ member management be selected from $40$ men and $40$ women so that there is a majority of women?

4 votes

Understanding a proof of RREF uniqueness

4 votes
Accepted

How to find the equidistant middle point for 3+ points on an arbitrary polygon?

3 votes
Accepted

Denoting the sum of $n$ odd numbers $1+3+5+\cdots+(2n-1) = 1+3+5+\cdots+(2n+1)$?

3 votes
Accepted

The number of paths on a graph of a fixed length w/o repeatings

3 votes

Function which takes every value uncountably often

3 votes
Accepted

The relation between face counts and edge counts in a polyhedron, $3f_3 + 4f_4 + 5f_5 +\dots = 2E$

3 votes
Accepted

Is there a more intuitive way of coming up with matrices for problems like this? E.g. Find two matrices B and C with AB = AC, and B does not equal C

3 votes
Accepted

How to find the homogenous system of equations from the solution space **W**?

3 votes
Accepted

An object is placed in front of a plane mirror of length $L$ ...

3 votes

How to find a point which lies at distance d on 3D line, given a position vector and direction vector?

3 votes
Accepted

What is this lazy sum notation supposed to mean?

3 votes
Accepted

How many outcomes are there when you roll 4 dice?

3 votes

Counting ordered pair $(m,n)$ in natural numbers satisfying an inequality

2 votes

Proving Replacement Theorem.

2 votes

Find the volume of the solid generated by revolving the region described below about $x=4$

2 votes

Take binary expansion and convert it to fraction

2 votes

Problem with understanding the kernel of a matrix.

2 votes
Accepted

Number of lines formed by sides of polygon

2 votes
Accepted

Find depth of three node tree

2 votes
Accepted

Are there anything wrong in the following proofs

2 votes

finding eigenvalues and eigenvectors

2 votes

How fast is the radius of the balloon changing at the instant the radius is 1ft and 2ft

2 votes
Accepted

May be this Conjecture is hold? with $n$ consecutive postive integers problem

2 votes

Prove a bipartite graph is connected

2 votes
Accepted

Does $x= y$ hold in this mathematical relation?

2 votes

To show that a given number is prime

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