Murderous Maths, Notes on everyday life, Simon's sketch book

The beauty of the Cubic Formula

One of Simon’s most beloved sources of knowledge is the Welch Labs channel. Recently he has been rewatching the series about imaginary numbers and the history of their discovery. Did you know that came about because of the Cubic Formula?

The proof of the Cubic Formula is a bit longer than that of the Quadratic Formula (on the yellow sheet)
Coding, live stream, Milestones, Murderous Maths, Simon teaching

Daniel Shiffman quotes Simon’s thoughts about complex numbers

NYU’s Associate Professor Daniel Shiffman quotes Simon during a Coding Train live tutorial from New York about Fourier Transform Drawings on 16 January 2019. Simon was participating via the Slack chat. This is just an example of how Simon takes part in the live sessions on a regular basis.

Link to the actual live stream: https://www.youtube.com/watch?v=0b3R8oWffkw

Milestones, Murderous Maths, Notes on everyday life, Simon's sketch book

Behind the scenes

This is a behind the scenes video (Simon wasn’t even aware of me filming at first, but he always talks to himself when working out a proof, so that helps). The video shows Simon looking for the number z if sin(z) = 2. He watched this problem explained on the Blackpenredpen channel once, then marched into another room (where he has his whiteboard) and started trying to construct the solution on his own. His solution was partially based on what he saw in the working out shown by Blackpenredpen and partially he worked out the proof himself (and it just happened to coincide with that of Blackpenredpen). He only briefly consulted the explanation video three times while working on the proof. “My proof expanded some steps out so it’s clearer where I’m coming from,” Simon says.

Here is a picture of the work done:

And some pics of the working out in progress:

Simon at first made a mistake in his definition of ln(i):

But later he corrected himself, and that’s the part you can see in the video.

Murderous Maths

Pythagorean Triples

Inspired by the 3Blue1Brown video “All possible Pythagorean Triples visualized”. Simon has recently learned about different ways to find Pythagorean Triples, using different formulas (involving complex numbers and not). His sketchbook at home is full of them, and even outside at the playground, while playing with his sis, he takes math breaks to recall the formulas in his memory.

 

DSC_0186