# Mathspp Blog

### A blog dedicated to mathematics and programming!

This blog has a really interesting assortment of articles on mathematics and programming. You can use the tags to your right to find topics that interest you, or you may want to have a look at

You can also subscribe to the blog newsletter.

##### Elo rating system simulation

Join me as I create a simulation that tries to test an Elo-based rating system for quizzes.

##### Problem #054 – imperfect compression

Can you show that perfect compression is impossible?

##### TIL #021 – Spouge's formula

Today I learned about Spouge's formula to approximate the factorial.

##### Problem #053 – weighing the odd one out

Can you find the fake ball by weighing it?

##### Problem #052 – chessboard domino

Can you tile a chessboard with two missing squares?

##### Problem #051 – queens and knights

How many queens and knights can you place on a chessboard?

##### TIL #017 – symmetrical indexing with bitwise inversion

Today I learned about the symmetry in indexing from the beginning and end of a list with the bitwise invert operator.

##### Problem #050 – 8 queens

In how many ways can you place 8 queens on a chessboard?

##### TIL #015 – DARPA network challenge

Today I learned about the DARPA network challenge and the power of referral systems.

##### Counting mosaics with APL

This is a short article on how I quickly used APL to verify my combinatorics calculations.

##### Problem #049 – coin pyramid

Can you make the pyramid point the other way by moving only three coins?

##### Problem #048 – trick or treat

Can you help these kids trick or treat their entire neighbourhood in this Halloween special?

##### TIL #012 – At operator for matrix multiplication

Today I learned that Python 3.5+ supports the operator @ for matrix multiplication.

##### Problem #046 – triangle grid

Can you draw 4 triangles in this 5 by 5 grid, covering all dots?

##### TIL #007 – math.nextafter

Today I learned about the math.nextafter method.

##### Problem #045 – 1, 2, 3

Figure out the number I'm thinking of with a single question!

##### TIL #001 – ceiling division in Python

Today I learned how to do ceiling division in Python just with //.

##### Problem #044 – send more money

Can you solve this simple-looking arithmetic challenge?