If percentage points can equal decimal points, then $1.25$ should equal $125$% when multiplying $1.25$ by any number. Therefore $125$% of $0.75$ should eq...

I was asked to prove that on the unit circle, the rational points are dense. My idea is to first show that the point (3/5,4/5) corresponds to an irrationa...

Is the the intersection of a finite number of compact sets is compact? If not please give a counter example to demonstrate this is not true. I said that t...

How to evaluate $e^{2\ln(3)}$ without using a calculator? I've tried playing with $\ln$ but couldn't figure out

There's a great question/answer at: Calculating probabilities over different time intervals This is an awesome answer, but I'd like to ask a rel...

I post this question in stackoverflow here and was advised it was best suited for here. I am trying to understand the maths behind trilateration, we have ...

I've been reading through Evans' excellent Introduction to Stochastic Differential Equations (used to be lecture notes available on his website ...

In my final mathematics test, I have a bonus question: How many axis of symmetry of the cube are there? The teacher gives me the definition: Definition: I...

Can somebody explain me step 3, in the following link - here

Please help me prove by induction that $\displaystyle\forall n\in {{\mathbb{N}}^{*}}$, $\displaystyle\forall {{a}_{1}},\ldots ,{{a}_{n}}\in {\mathbb{R}}^{...