Musings

Grothendieck Erdos Sophie Nueman Turing

I wrote about 180 blog posts from October 2014 to December 2018 at Gaurish4Math (Caution: This WordPress website is not mobile friendly and is supported via advertisements. Consider using ad-blocker like uBlock Origin)

Some old posts have been copied here. I might also write some new posts here once in a while, but they need not be about mathematics.

2022

2021

Reading and annotating papers

3 minute read

Published:

Following is the comparison of tech specs of my new tablet (USD 315 + taxes) with the older tablet (USD 280 + taxes):

Higher Arithmetic Computations

15 minute read

Published:

In this post I discuss the options available for doing computational experiments in advanced number theory.

2020

2019

Space filling curve

4 minute read

Published:

In this post I would like to share my old writeup about there existence of a continuous surjective map from $\mathbb{R}$ to $\mathbb{R}^2$. In other words, we will prove that that Hilbert’s Curve is a continuous surjective map. The proof presented here was explained by Dr. Manas Ranjan Sahoo, 3 years ago on 15th April 2016.

2018

Richert Theorem

2 minute read

Published:

In 1852, Chebyshev proved the Bertrand’s postulate:

2016

Cross Diagonal Cover - V

1 minute read

Published:

This has been an exciting week! Prof. Sukanta Pati proved an interesting theorem that enables us to get decomposition of $2m-1\times n$ grids into simpler grids, hence simplifying counting to large extent (note that $m=n$ is also allowed). It enables us to surpass the difficulty posed by “more than two crosses in one square”, thus supporting the idea of colouring (i.e. not giving importance to two crosses in a square).

Cross Diagonal Cover - IV

5 minute read

Published:

While discussing this problem with Dr. Shailesh Shirali, he commented that there has to be a way to phrase the problem in terms of a ray of light being reflected off the walls of the rectangle, bouncing around, proceeding from one corner to some other corner.

Cross Diagonal Cover - III

1 minute read

Published:

I found many counterexamples to my conjecture, like

  • for Case 2 in 7 by 5 grid we have 12, 11 by 5 grid we have 19 and 15 by 5 grid we have 26 filled squares
  • for Case 3 in 4 by 10 grid we have 10 filled squares

Also, grant93jr made the following comment:

Cross Diagonal Cover - I

1 minute read

Published:

While doodling in my college classes, I designed an algorithm which I called Cross Diagonal Cover Algorithm:

2014

Spot The Flaw

less than 1 minute read

Published:

Many of you must have seen numerous examples of such situations where we get an absurd result and have to spot flaw in proof.

Hello World

less than 1 minute read

Published:

Here is my first post.