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Every blog post that took off on Hacker News, ranked by the votes of its best submission. 2,851 posts.

Math & Algorithms
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2118

Demystifying Tupper's Formula

A book I was recently reading mentioned a mathematical curiosity I haven't seen before - Tupper's self-referential formula . There are some resources about it online, but this post is my attempt to explain how it works - along with an interactive implementation you can try in the browser.

2126

Understanding the Y Combinator

This article is about the Y combinator, a fixed-point combinator that provides a way of using recursion in scenarios and programming languages where symbols are not available. The concept of the Y combinator itself is closely related to lambda calculus (λ-calculus) and functional programming languages. More…