Hacker News: cpp_frog

The quadratic sandwich

cpp_frog — Wed, 20 May 2026 12:06:56 +0000

Article URL: https://fedemagnani.github.io/math/2026/04/08/the-quadratic-sandwich.html

Comments URL: https://news.ycombinator.com/item?id=48206387

Points: 138

# Comments: 14

Using calculus to do number theory

cpp_frog — Mon, 16 Mar 2026 14:12:45 +0000

Article URL: https://hidden-phenomena.com/articles/hensels

Comments URL: https://news.ycombinator.com/item?id=47399330

Points: 136

# Comments: 21

The Riemann hypothesis (or, how to earn $1M)

cpp_frog — Tue, 24 Feb 2026 11:05:36 +0000

Article URL: https://hidden-phenomena.com/articles/rh

Comments URL: https://news.ycombinator.com/item?id=47135611

Points: 1

# Comments: 0

New comment by cpp_frog in "Wacky Fun Physics Ideas"

cpp_frog — Tue, 02 Dec 2025 14:53:49 +0000

One of the most fascinating characters out there for sure, without fail his posts make me consider a new perspective.

He left HN unfortunately, he might be too brash for this site (or this place is too wimpy for him).

Iterative DFS with stack-based graph traversal (2024)

cpp_frog — Thu, 21 Aug 2025 17:09:08 +0000

Article URL: https://dwf.dev/blog/2024/09/23/2024/dfs-iterative-stack-based

Comments URL: https://news.ycombinator.com/item?id=44975313

Points: 39

# Comments: 9

New comment by cpp_frog in "150 years of Hans Christian Andersen"

cpp_frog — Thu, 31 Jul 2025 12:22:42 +0000

I read The Steadfast Tin Soldier for the first time when I was a kid but it didn't have a special meaning for me until my late teens, when I first fell in love.

New comment by cpp_frog in "PlasticList – Plastic Levels in Foods"

cpp_frog — Tue, 24 Jun 2025 16:11:10 +0000

It's easier to walk up to the woman that's been eyeing you at the party, speaking from experience.

Ten Digit Problems (2011) [pdf]

cpp_frog — Fri, 07 Mar 2025 11:06:17 +0000

Article URL: https://people.maths.ox.ac.uk/trefethen/publication/PDF/2011_137.pdf

Comments URL: https://news.ycombinator.com/item?id=43289205

Points: 54

# Comments: 2

New comment by cpp_frog in "Interview with gwern"

cpp_frog — Thu, 14 Nov 2024 11:48:07 +0000

There is a comment on the r/slatestarcodex subreddit with supposedly true information about him (which I found googling 'who is gwern'), but it left me with even more questions.

EDIT: grammar

Revisiting the Classics: Jensen's Inequality (2023)

cpp_frog — Wed, 21 Aug 2024 14:05:48 +0000

Article URL: https://francisbach.com/jensen-inequality/

Comments URL: https://news.ycombinator.com/item?id=41310433

Points: 89

# Comments: 8

New comment by cpp_frog in "A simple proof that pi is irrational [pdf] (1946)"

cpp_frog — Sun, 11 Aug 2024 22:33:51 +0000

For anyone interested who could not follow the reasoning in the paper, it is explained extensively in this video [0] by Michael Penn.

[0] https://www.youtube.com/watch?v=dFKbVTHK4tU

New comment by cpp_frog in "SymPy: Symbolic Mathematics in Python"

cpp_frog — Wed, 28 Feb 2024 15:06:14 +0000

Symbolic mathematics is severely underexplored in undergraduate studies, and the little exposure I had was generally tied to proprietary software such as Mathematica and MATLAB. I learned to use it as an imperfect extension of pen-and-paper thinking, and source code for more advanced stuff gets shaky the deeper into abstraction one goes. For example, I work in a field of mathematics/engineering that requires heavy use of tensor calculations. My go-to tool for that is Maxima, however, it has limited and cumbersome packages for it (see [0]). Now for more sophisticated calculations I resort to SymPy, not necessarily because of better handling of symbolics but because of the abstractions that Python already has. Maybe someday I'll get to read the Principles by Norvig and fix Maxima to suit my needs (if anyone has better references to read Maxima's source code/implementation of tensor computations/symbolic (tensor, geometric) algebra I would be grateful to know).

[0] https://arxiv.org/pdf/cs/0503073.pdf

New comment by cpp_frog in "Ten years of remembering every day that passes (2022)"

cpp_frog — Sat, 24 Feb 2024 12:10:40 +0000

The moments captured in my images are fresh, but my perspective on them changes.

I am doing an experiment in memory and trying to memorize the name of every U.S. county, with the aid of a map. Several months in I can say that the brain inexorably will tie names together (wether by geographical proximity or etymology, e.g. Imperial-Riverside-San Diego or Redwood-Greenwood), and the addition of new names affects the perception of the ones before, or the perception of words which happen to be county names. I could write an entire essay on the limits of memory, but it would hardly be better than Jorge Luis Borges's story Funes, the memorius.

For anyone curious I can name 80% of U.S. counties with the aid of a blank map, and my geographic intuition has improved greatly. Every county (and county name) has a history attached to it, and sometimes when someone tells me where they grew up, I can guess their ancestry more or less, especially if they come from rural areas. It surprises them, sometimes even more when they know I'm not american.

New comment by cpp_frog in "What is going on in Argentina?"

cpp_frog — Wed, 21 Feb 2024 12:54:45 +0000

In order to have a mature discussion about this topic, it's necessary for people to know about the economic and political history of Argentina. It's impossible to understand their current situation without going back to the 1940s. Bad faith arguments look over the fact that Argentina has had decades of incredible economic distortions as a consequence of political rot, and that undoing those distortions is not achieved in the time Milei has been president (I personally don't believe they could be undone in less than a presidential term).

Data structures as topological spaces (2002) [pdf]

cpp_frog — Fri, 16 Feb 2024 12:57:24 +0000

Article URL: http://mgs.spatial-computing.org/PUBLICATIONS/umc02.pdf

Comments URL: https://news.ycombinator.com/item?id=39396337

Points: 170

# Comments: 46

New comment by cpp_frog in "Thomas Cochrane"

cpp_frog — Tue, 02 Jan 2024 19:10:00 +0000

He is known by all members of the Chilean Navy [1], he is not obscure in this part of the world. By the way, I am chilean and lived most of my childhood just a block away from Lord Cochrane street [0], in downtown Santiago, which is one the busiest places in the whole country (and those adjacent blocks have seen some history).

[0] https://www.google.com/maps/place/Lord+Cochrane+1-99,+Santia...

[1] https://www.memoriachilena.gob.cl/602/w3-article-726.html (documents, images and more)

Voronoi Diagram and Delaunay Triangulation in O(nlog(n)) (2020)

cpp_frog — Tue, 24 Oct 2023 13:29:54 +0000

Article URL: https://codeforces.com/blog/entry/85638

Comments URL: https://news.ycombinator.com/item?id=37998923

Points: 109

# Comments: 33

Chess and solution pool with linear programming (2018)

cpp_frog — Mon, 02 Oct 2023 13:50:38 +0000

Article URL: http://yetanothermathprogrammingconsultant.blogspot.com/2018/11/chess-and-solution-pool.html

Comments URL: https://news.ycombinator.com/item?id=37738088

Points: 81

# Comments: 3

New comment by cpp_frog in "GNU/Linux Aviation HOWTO (2006)"

cpp_frog — Sat, 23 Sep 2023 22:35:31 +0000

As an occasional general aviation pilot (I found this HOWTO after trying to find tools to aid in flight plan calculations), I think it would be great if we took it a step further and make a full-fledged Linux avionics system, but it seems unlikely [0]. And Garmin will likely not be replaced in a dozen years.

[0] https://aviation.stackexchange.com/questions/36853/do-safety...

New comment by cpp_frog in "Exposition of a New Theory on the Measurement of Risk (1738) [pdf]"

cpp_frog — Fri, 15 Sep 2023 12:15:31 +0000

I read the two first or so papers of the book and understood them, but I coulnd't get past because I lack the sufficient probability theory (I'm a functional analyst). Now it's been in my queue for some time but I hope to get to it after finishing the references I'm reading now.