# Calculus for Mathematicians, Computer Scientists, and Physicists by Daniel Flegg

Hacker Approved page: https://hackerapproved.com/p/calculus-for-mathematicians-computer-scientists-and-physicists/

4 people recommended Calculus for Mathematicians, Computer Scientists, and Physicists by Daniel Flegg in Hacker News comments and 4 criticized it, November 2025 to October 2026. It was recommended in 1 of 12 months, in 1 thread. It does not meet the Hacker Approved badge rule.

4 of the 4 people who recommend it commented in one thread, “Calculus for Mathematicians, Computer Scientists, and Physicists [pdf]”.

**Verdict:** People who like it find it a succinct, rigorous survey of many topics and a useful reference, though it suits only some readers.

Summary written by Claude from 9 comments.

## Why people recommend it

- Succinct coverage of many topics (1 comment in the sample): "has a succinct coverage of a broad range of topics from Mathematics; just the right understandable level of rigor" ([source](https://news.ycombinator.com/item?id=46030256))
- Useful reference for hard topics (1 comment in the sample): "this pdf is a nice reference for things complete unreadably on Wikipedia" ([source](https://news.ycombinator.com/item?id=46030977))
- Liked after a brief look (1 comment in the sample): "So far, I've only had a brief look at this book and what I've seen I like very much." ([source](https://news.ycombinator.com/item?id=46030172))

## What people warn about

- Not suited to every reader (1 comment in the sample): "this may not be the most helpful approach for intended readers" ([source](https://news.ycombinator.com/item?id=46035962))

## Other calculus textbooks people recommend

- [Calculus by James Stewart](https://hackerapproved.com/p/calculus/): 9 recommend, 1 mixed, 3 criticize
- [Calculus Made Easy by Silvanus P. Thompson](https://hackerapproved.com/p/calculus-made-easy/): 5 recommend, 0 mixed, 1 criticize
- [Elementary Calculus: An Infinitesimal Approach by Keisler](https://hackerapproved.com/p/elementary-calculus-an-infinitesimal-approach/): 3 recommend, 0 mixed, 0 criticize

## The badge

A product earns the Hacker Approved badge when at least 10 people recommend it, recommenders outnumber critics at least 2 to 1 (mixed feelings count toward neither side), it was recommended in at least 4 of the 12 months and in at least 5 different threads, and no single thread supplies more than half of the people who recommend it. Health and money products are never badged.

## Cite as

Hacker Approved, "Calculus for Mathematicians, Computer Scientists, and Physicists by Daniel Flegg", https://hackerapproved.com/p/calculus-for-mathematicians-computer-scientists-and-physicists/ (4 recommend, 0 mixed, 4 criticize; Hacker News comments, November 2025 to October 2026).

Counts updated 3 Nov 2026, with data through October 31, 2026.