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_jcrossley

Joined 6 years ago

Karma
139
Submissions
79
Member since
Nov 20
Ex-Apple/Google/Lyft iOS engineer and classical guitarist. Two successful iOS sideprojects (Pixelist Habit Tracker, Mujo Music Practice Journal).
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Recent submissions

Comment · 1 month ago
Two YouTube math channels. I have a degree from 2012 before switching to software; now I’m on a path to becoming a schoolteacher as a 2nd career. Using YouTube as a way to deliberately practice teaching & refreshing skill.

“Math Can Be A Hobby”, lecture series based on Serge Lang’s Basic Mathematics. Unexpected breakout success, 350k+ views on 1st video and rising. https://youtube.com/@MathCanBeAHobby

“jcpractices math”, a livestream where I share my daily-ish study sessions, thinking out loud with iPad on screen. Emphasis on algebra and number theory. https://youtube.com/@jcpracticesmath

Comment · 1 month ago
Not sure when this was written, but I believe I found it ~3 weeks ago (pre-FLT and NS announcements)
Comment · 1 month ago
Not mine - stumbled across this short story about a week ago. Not sure when it was written, but it was before Anthropic’s FLT announcement.
Comment · 2 months ago
+1 I loved FIS for my Advanced Linear Algebra class
Comment · 2 months ago
As a math educator, I strongly dislike both Strang and Axler for a 1st course. I've heard great things about Strang's lectures, but his book is disorganized and too heavy on computation. Axler's book is wonderful, but as explicitly stated on the back cover, it's designed for a 2nd course and primarily aimed at math majors.

I recommend and teach my YouTube Live series out of Fraleigh [1], but unfortunately it's out of print. Lay seems to be a good modern alternative.

[1] https://linear.mathcanbeahobby.com

Comment · 1 year ago
Neat! It feels like bridging the gap between infinitesimals intuition and epsilon-delta formalism. I wonder whether this approach could make a 1st course more rigorous, and whether that would be a good thing.
Comment · 1 year ago
I have a hard time remembering this. But there’s also right-click, then Option to show secondary options (Copy becomes Move)
Comment · 1 year ago
https://mujo.app I’ve been building a minimalist productivity app for musicians. Mujo adds time tracking, task management, notes and other “practice journal” tools into a simple metronome interface. Been hacking at the iOS version for a while, and starting to think about Android.
Comment · 2 years ago
I built a proof of concept for a VC-scale app, and something like this is one of the core features. I applied to YC S24 and didn't get an interview (SUPER understandably). If anyone wants to hear details, shoot me an email (in bio); this project's vaporware until I find the right partner.
Comment · 2 years ago
I’m sad to see this - I used to binge their videos a few years back. As someone who discovered and fell in love with classical music late in life (~26), and is now a hobbyist content creator [1] they were a terrific bridge into learning about orchestral instruments that I don’t play.

I agree with others that this seems like an attempt to pivot to “music as a higher art”, e.g. the rumored Two Set Academy, like a Tonebase competitor. Which is an absolute shame, because I think they did wonders to challenge that status quo and make classical music fun.

[1] Shameless, but if anyone is curious about an adult hobbyist learning classical guitar, I’m livestreaming almost daily: https://youtube.com/jcpractices

Comment · 2 years ago
Just hit top 30 in all the standard races - thanks so much, this was such a delightful way to practice my new Glove80 :)
Comment · 2 years ago
Building Mujo, a minimalist musicians' practice journal for iOS. It integrates time tracking, note taking, and task management into a familiar metronome UI/UX. I dearly love it (1400+ hours logged!) and it's slowly building traction. https://mujo.app

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