## Are there any significant differences between studying functional analysis from a normed space perspective versus a metric space perspective?

Does it matter if functional analysis was introduced from a normed space versus a metric space formulation? Are all major theorems from functional analysis (such as Banach contraction mapping, Hahn Banach theorem…) directly transferable if we exchanged every instance of norm with metric? I am asking because strictly speaking a metric is different than a … Read more

## How to express log52\log_5 2 in terms of a and b (Refer to qn)

In my textbook, I came across this interesting question which I am currently struggling to solve: If log62=a and log53=b, express log52 in terms of a and b The solution given is ab1−a but I do not know the working behind this. What is it? Answer An alternative, although I agree with the exponential approach, … Read more

## How to train for olympiads?

I’ve been training a lot for mathematical olympiads the past months, and I would like how to go further. Does anyone know interactive websites training your math skills? Or anything else that could train my math skills, but I’d like not just to do exercises from a book… Answer Here are two important websites, apart … Read more

## How do you study mathematics? [closed]

Closed. This question does not meet Mathematics Stack Exchange guidelines. It is not currently accepting answers. Want to improve this question? Update the question so it’s on-topic for Mathematics Stack Exchange. Closed 4 years ago. Improve this question Which is (or was) your method to study pure maths in the university? I’m interested in knowing … Read more

## 9x multiplication table trick: How does it work?

There is a trick that is taught to children to help them remember their 9 times tables. As illustrated below, the digits of the multiplication problem in question can be determined by: Splitting the digits 1 to 0(10) by whatever number you are multiplying 9 by. The resulting sums of the digits on either side … Read more

## What are amazing results concerning Euler totient function? [closed]

Closed. This question needs to be more focused. It is not currently accepting answers. Want to improve this question? Update the question so it focuses on one problem only by editing this post. Closed 3 years ago. Improve this question What are important or amazing results involving the Euler totient function? I am aware of … Read more

## Why does math work if there are too many paradoxes?

I’m a newbie that studies applied maths and I have been learning about measure theory for the past few weeks and I came across things like Banach–Tarski paradox, Gödel’s incompleteness theorems, axiom of choice.. Which made me feel super uncomfortable and confused so my question is why is maths seem to be working if the … Read more

## How Do Mathematicians ‘make up’ or perhaps more correctly ‘derive’ equations

I know this is definitely a thing otherwise we wouldn’t have equations. What are the methods for making up an equation from scratch and from making up an equation from an existing equation? The only way I have been able to do this is using dimensional analysis and I’d like to learn other ways, if … Read more

## Recommendations for chess themed math exercises

I am trying to organize a recreational math class for a group of high school students (mixed years), themed around the game of chess. Ideally, I would like to prepare exercises that simply require a basic knowledge of chess rules. What I have found so far tend to be exercises more on the advanced side … Read more

## Why is the average taken this way, when calculating square root of a number?

I was watching a video lecture from the series Introduction to Computer Science and Programming using Python (see here). It presents an algorithm for computing the square root of a number x. It starts with an initial guess g, and then taking the average g+xg2, and repeating. Why did they not take a simple average … Read more