HeyJaredMike X Cohen
Ex-neuroscience professor, current independent educator. I help people understand applied math and AI, machine-learning, deep learning, LLM mechanisms, etc. My motto is "you can learn a lot of math with a bit of coding."
- Indexed issues, last 90 days
- 9
- Latest publication
- Sep 21, 2026
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- Earliest in this view
- Jul 13, 2026
Latest issues
Householder reflections! (It's about math, not home ownership) (opens the original)
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What you’ll learn from reading this postIf you do almost anything with applied linear algebra, you probably rely on QR decomposition. And QR decomposition relies on a technique called Householder reflection. Householder reflections are a real work-horse in numerical methods, and underlie eigenvalue extraction, solving systems of equations, control engineering, computational simulations, and .In this post, you will learn exactly what a “Householder reflection” means, how it works, and how it’s us
Givens angle, Jacobi rotations, and eigenvalues (opens the original)
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Overview of this postSome of my posts are technical, others are for general audiences. This post is the former.You will enjoy engaging with this post if you want to know how matrix diagonalization works, including eigenvalue and singular value decompositions, principal and independent components analyses, computer vision and video mechanics, and other important data-science applications.Necessary background: I have tried to make this post approachable, but it is a technical math-heavy topic. You
The brain is overrated (part 1) (opens the original)
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Over the last few weeks, we have taken stock of the hype around direct measurements of brain signals in fields like neurotech (wearables), biopharma, basic neuroscience and clinical research. Neurotech seeks to extract and interpret signals from our brains, with a goal of ushering in a world in which we connect to one another and to machines via wearable devices. In clinical practice, the goal is to use direct brain measurements to diagnose brain diseases and mental health disorders, and to pred
Mike X Cohen & Chantel Prat (opens the original)
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Get more from Mike X Cohen, PhD in the Substack appAvailable for iOS and Android<a class="install-substack-app-embed-link" href="https://substack.com/app/app-store-redirect?utm
My ultra-minimalist tech work setup (opens the original)
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One of my defining personality and lifestyle characteristics is that I’m a minimalist. I’d describe myself as a maniacal minimalist. Minimalizing my life is a hobby (ahem, obsession). The goal is to minimize the number of molecules I carry around with me, without sacrificing my mental or physical health, or my ability to work.Even the way I see math is through minimalistic eyes.What you will learn in this postIn this post, I will describe my 6-month journey to creating a minimalist tech setup. I
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