0.1 Sets

If like me, you’ve spent most of your mathematical high school years introduced to basic sets at the beginning of the year from Grades 8 to 12, then I think you’d agree that sets was one of the quickest and easiest sections we traditionally did. We would quickly recap the same fundamental properties of sets before moving onto more interesting topics, usually algebra. The section would go a little bit like this:

  • define the differences between whole and natural numbers, integers, rational numbers and real numbers
  • define the differences between unions, intersections and complements, usually through the understanding of Venn-diagrams
  • use set builder notation (introducing algebra through this)

If like myself, you truly believed that this was as complicated as sets could ever get, then you, dear reader, like my former-myself, are in for a treat. In university, we build on these basic ideas and have a more in depth understanding about the importance of sets and their greater role in the scheme of mathematics.…

By | March 7th, 2018|Uncategorized|5 Comments

A quick introduction to writing mathematics in WordPress using LaTeX

Here are a couple of very useful links about writing mathematics, for new authors of this blog:

I will update this as I find more useful material.

  • Generally I like to use the Visual Tab on the editor here rather than the Text Tab, unless there is some sort of strange formatting in which case I will go in and alter the Text.
  • I usually like to put formulas centrally justified on their own on a line with blank lines above and below.
  • Add Media to upload pictures or gifs and use the Fusion Shortcodes button (to the left of the yellow star in the blue box), to embed Youtube content.

Please let me know if, as an author, there is anything which is unclear about posting here and I will update accordingly.…

By | February 28th, 2018|Uncategorized|0 Comments

e-day – A mathematical holiday celebrated on February 7th

Today, February 7th, 2018, is called e-day because e is approximately 2.718, and this date is written 2/7/18 in some parts of the world.

e, also called Euler’s Number after the Swiss mathematician Leonhard Euler, is a very important constant that comes up in many different places in mathematics. The numer e was discovered by the Swiss mathematician Jacob Bernoulli while studying compound interest where e arises as the limit of (1 + 1/n)n as n approaches infinity. e can also be calculated by summing:

The constant e appears naturally on the exponential function, which models growth. Hence, the same way that the constant π appears in everything that is round, the number e appears in everything that grows: size of baby animals, leaves in trees, bacteria populations, spreading of diseases, spirals in flowers and snails, radiactive decay of elements, money invested in a bank, processing power of computers… Everything that grows the faster the bigger it is follows an exponential law, and contains the number e.

By | February 7th, 2018|Uncategorized|1 Comment

Can you find a simple proof for this statement?

I thought more about the last question I added into the addendum of the Numberphile, Graph theory and Mathematica post

It can be succinctly stated as:

(\forall m\in\mathbb{Z}, m\ge 19) (\exists p,q\in\mathbb{Z}, 1\le p,q<m, p\ne q) such that \sqrt{p+m}\in\mathbb{Z} and \sqrt{q+m}\in\mathbb{Z} .

In words:

For all integers m, greater than 19, there are two other distinct positive integers less than m such that the sum of each with m, when square rooted is an integer.

What is the shortest proof you can find for this statement?

How clear is this post?
By | January 17th, 2018|Uncategorized|2 Comments

Sticky Post – Read this first. Categories and Links in Mathemafrica

The navigability of Mathemafrica isn’t ideal, so I have created this post which might guide you to what you are looking for. Here are a number of different categories of post which you might like to take a look at:

Always write in a comment if there is anything you would like to see us write about, or you would like to write about.

How clear is this post?
By | January 17th, 2018|Uncategorized|0 Comments

Some slightly more advanced topics on Mathemafrica

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By | January 17th, 2018|Uncategorized|1 Comment

Posts in Shona, Sepedi and IsiXhosa and…

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By | January 17th, 2018|Uncategorized|0 Comments

Book reviews

 

By | January 17th, 2018|Uncategorized|0 Comments

The Strength in Numbers: The New Science of Team Science – By Barry Bozeman & Jan Youtie, a review

NB. I was sent this book as a review copy.

https://press.princeton.edu/sites/default/files/styles/large/public/covers/9780691174068_1.png?itok=cyvsDVDU

From Princeton University Press

If you want insights into what makes a good collaboration dream-like and a bad collaboration nightmarish, this is the book for you.

In short, The Strength in Numbers details an extremely important piece of research, with reference to many other studies, which aims to analyse collaborations within STEM, and figure out not only measures of collaboration effectiveness, but also ways to make your own collaborations more likely to succeed.

Academia is a funny old game, where there is extensive training in certain aspects of the job (the fundamental tools of science, for instance), and others are left to the researcher to try and piece together as they go along. Some obvious and frequent examples of these are:

  • How to write and give talks effectively
  • How to mentor young researchers
  • How to best disseminate your own knowledge

and perhaps most importantly, how to create an effective collaboration.…

By | January 16th, 2018|Uncategorized|1 Comment

Graph Theory, Numberphile and Mathematica

Edit: I made a mistake with some of the language here. A comment from a true graph theorist:

“Hamiltonian” usually means there’s a hamilton/hamiltonian cycle. Graphs with a hamilton path are “traceable”. Hamiltonian implies traceable, but not conversely.

Thus, I have edited below accordingly.

——————————-

There was a nice video up on Numberphile about a problem which could easily be explained to a school student, and yet we don’t yet know the answer to it. See the videos here:

and

The game is the following: Given a sequence of consecutive integers, draw a graph where the nodes are the integers and there is an edge between each integer if their sum is a square number.

If we take the numbers from 1 to 12, then the following would be the associated graph (note that there are three disconnected pieces of it).

graph12Note that this is a disconnected, undirected graph. Looking at some of the edges.…

By | January 15th, 2018|Uncategorized|1 Comment