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Comment by Dr_Birdbrain | Hacker News Reader

It’s one of those things where if you don’t have the math knowledge, the opportunities to apply it will be literally invisible to you.

If all you have is a hammer, everything looks like a nail—but the converse of that is that if you have never seen a hammer, nails will be invisible and incomprehensible to you, they will just blend into the background of noise.

When I learn about something, I suddenly see it everywhere.

Hypothetically, if you wanted to learn it, I would recommend devoting the first hour of every day to it. Before your brain fully wakes up and starts asking why you are doing it, just do it.

I assume you have the standard CS background, with decent knowledge of discrete math, calculus, linear algebra. I would recommend starting with a graduate-level linear algebra textbook. A friend of mine used to say “linear algebra is the new addition”, it permeates everything, and knowing it well produces massive dividends.

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Why should I think I'll find uses this time, when I already burned time and money learning (some of) it once, and lost all that precisely because I never encountered any need for it? An hour a day is a huge time investment for something that's already failed to prove its worth once. Like I'm sure I could go find some jobs that I can't get now because I lack math skills, and I'm sure some (far from all!) of those pay better than what I make now, but... like... that's equally true of jobs that require better business or speaking skills, and unlike linear algebra I can easily point to ways those skills could be beneficial in everyday life and in my existing job. Where's the corresponding immediately-useful benefit for lin. alg.?

Clearly there are people that don’t need to know math. You happen to be one of them, congratulations. Though I know I’d be bored out of my mind if I did software work that only used high school level math and logic.

Sure, some people need it, I was just responding to:

> I'm still appalled at how people can manage to gather the courage to utter they don't need math.

When... well, the vast majority of people really don't. They promptly forget almost everything back to about 6th grade math, shortly after finishing formal education, because they truly never need it, so that knowledge and those skills quickly rust.

If these people in-fact could make great use of it, such that it's "appalling" that they don't think they need it, then that's probably what school should focus on teaching, at least for non-math-majors. Laser-focus on application in everyday life. Especially in k-12. If it's actually useful and people are being forced to spend hundreds to thousands of hours learning junior high, high school, and college math, but then losing most of it because they never see any use for it, that's a tremendous failing of curriculum that should be addressed as directly as possible. If such a program wouldn't succeed because it's actually true that most people don't really need most of that math for anything, then we ought not be "appalled" at their correctly assessing that truth.

I see what youre saying. I don't think it's a failure of the curriculum to teach people things when they are young they don't end up using. Certainly a 13 year old isn't going to know what their future career path/interests will be (some do, but most don't) and shouldn't let them shut doors down the road at such a young age. I think at this point high school has devolved to the point of just giving everyone the basic broad skills that they could feasibly succeed at any college major. The seniors that have already decided they just want to build houses all day can complain during math, we all heard it, "when will I ever use this", but the problem is the answer is not "never" and its not "always" its "we don't know, but you may need it, and closing those doors now will limit your future potential".

This is a great description, thank you! What you've said is precisely the reason I emphasised knowing a bit of foundational math, e.g. topology.

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