Woke up at 7:30, exercise and run took till 8:30 mostly because of procrastinating, then at 8:30 I got a call which delayed me till 9:00, 9:00 to 9:20 I showered then spent 15 minutes unboxing the math book that arrived and showing people on discord.

It's actually quite funny, the cover makes it look soo much like a high school algebra book

But the inside reveals the horrifying truth

I can't wait to read this in public and confuse people :D

Spent 9:30 - 10:45 doing axler exercises, solved 3d/7 and 3d/8. Realized I can use 2.34 to get $U \oplus \text{null }T = V$ instead of having to descend to the level of bases.

Spent 2h 30m debugging a demonic computer problem, my dads computer screen was not working on linux. I found a workaround quickly but I could not find the root cause

I spent MORE THEN TWO HOURS falsifying every hypothesis I could come up with, the only time the screen woulden't work was when I use

• the big monitor

• the short cable

• hdmi 1

• the minipc (my dads cheapish pc)

Changing ANY ONE OF THESE fixes the problem, replace the hdmi cable and it works, use my brothers pc with the short cable and it works, use hdmi1 the short cable and the small monitor and it works, etc. look I even made a table

This was really not worth my time, but I did learn some fundemental lessons about debugging and science, even if all my hypotheses were wrong I at least knew they were wrong, which is several steps above random guesssing (the dumb debugging technique).

I spent 1:30 - 2:10 chatting on discord recovering from the demon encounter, and 2:10 - 2:50 helping setup eruch's computer

Spent 2:50 - 3:40 Reading the algebra book, I diden't get that far and diden't have much mental energy. I did get to practice block multiplication though, and review the proof that having a left and right inverse implies they're equal and the function is invertible.

Basically, suppose $i$ is the identity function $i(x) = x$ and $f,g,h$ are functions such that $fg = i$ and $hf = i$ where $(fg)(x) = f(g(x))$ denotes composition. Then

This is a cool perspective I learned a few weeks ago from Algebra Chapter 0. Note that a left inverse exists if and only if $f$ is injective and a right inverse if and only if $f$ is surjective.

Spent 3:40 - 6:20 practicing web development by building a clone of the lesswrong homepage. As of today my clone looks like this

It's really nice to be able to steal images, content and design from an existing site so I can focus purely on drilling my implementation skills (ie. html, css, js). This is similar to how Benjamin Franklin taught himself writing

With this view I took some of the papers, and, making short hints of the sentiment in each sentence, laid them by a few days, and then, without looking at the book, try'd to compleat [sic] the papers again.

You can see my clone here and view the source on github.

Then I spent 6:20 - 8:10 Cooking myself food and eating + chatting on discord. I should have waited for my parents to get home instead of cooking for myself because

• It would have saved ~1h of time (I spent a long time snacking)

• The food would have been better

If I do cook for myself again I'll try to avoid snacking on my computer, if I eat fast I can eat in 30m and cook in ~20m.

Spent 8:10 - 10:00 Chatting on discord and writing this journal entry, I've decided to take journaling more seriously and publish them for my friends to read

Time wasted: ~1h 30m after the demon encounter, ~1h in the morning, ~1h eating, maybe 1h after dinner from being unfocused on discord.

Total: 4h 30m (bad day).

Tomorrow I've got to get up early to go to the chiropractor, so I'll get to work late again but I'll try and waste less time.