What is a Tensor?


Work Ethic Quote

I don’t really buy into the idea of the Protestant Work Ethic (nobody works harder than Japanese salarymen, and they’re pretty far removed from any Calvinist cultural heritage)

– J. D. Moyer

Happy Birthday, calibre

calibre turned 10 years old 5 days ago.

$$(I-A)^{-1}$$ trick

The geometric series equals if and only if .


I find zombies interesting on an intellectual level. The slow, mindless one that have to bite you. (Read The Zombie Survival Guide for more info.)

My (Odd) Reason for Liking the Solarized Dark Background

I think of math the same way I think of this shade of blue:

GoodNotes Templates

These are Blank and Cornell templates, in both Landscape and Portrait. They’re meant for any Retina iPad, including both iPad Pro sizes.

Easy Way To Remember Some Grammar (If You Have Some Math Background)

It’s annoying to remember the grammar rule for quantities that dictates when to use many vs. much, fewer vs. less, etc.

Funny quote from the inventor of `sendmail`

Some context: Eric Allman invented sendmail and is openly gay.

When String Becomes Dangerous

Try this command:

replacing spotify's newsfeed


The Most Original Idea I Know

Jack Sparrow said it best.

Reading Efficiently

This post summarizes what I think are some effective ways to read with the specific goal of gaining the information written in the text as fast as possible. This should only really be done when you’re trying to learn something factual from the book, because doing this to fiction is a great way to make it unbearable to read.

The Ardabil Carpet


Computers Ruin Memory

The more traditional Aram Chantat still tended to regard literacy as a weakness, liable to undermine the imagination and the memory.

Jamie Zawinski on Backing Up Data

On Your Options