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Ikiatl wrote:

Loved your Langford Pairing blog post. Found a small error in the proof of sufficiency. I think the value of \( c \) should be \( 4x - 1 \) and not \( 4x - 3 . \) Great blog post though!

18 May 2023 19:09 UTC | #1 of 7 comments

Presh wrote:

Wonderful Langford Pairing post. By the way, I believe there is a small typo in the formula for \( c. \) It should be \( c = 4x - 1. \)

05 Jun 2023 22:40 UTC | #2 of 7 comments

Susam Pal wrote:

Thank you, Ikiatl and Presh, for your comments. The formula for \( c \) indeed had a typo. Although I wrote the correct values for \( c \) obtained from the formula \( c = 4x - 1 \) in the examples, the formula itself was written incorrectly as \( c = 4x - 3. \) I have corrected Langford Pairing to use \( c = 4x - 1 \) now.

12 Jun 2023 07:18 UTC | #3 of 7 comments

Dan wrote:

Read Nested Code Fences in Markdown. Nice post! One tiny correction in this sentence:

So when we put Becky within a code span, the first backtick in Corey's face would terminate the code span immediately and then the rest of Becky would lie outside it.

I think that "Corey" should instead be "Becky".

21 Jan 2026 16:02 UTC | #4 of 7 comments

Susam Pal wrote:

Dan, Thank you for the correction. Yes, that should indeed be 'Becky'. I have made the correction now.

21 Jan 2026 20:13 UTC | #5 of 7 comments

Mario wrote:

Hi Susam. A small correction in Emacs Info Expressions. The prefix to copy the info expression is C-u 0 c, not C-0 c.

Also, news.ycombinator.com/item?id=40021782 links to emacs-info-expressions.html (note the "s" in "expressions"), which doesn't exist now (not sure if a bug or intentional rename).

11 May 2026 17:37 UTC | #6 of 7 comments

Susam Pal wrote:

Hi Mario! The key sequences C-u 0 c and C-0 c are equivalent in GUI Emacs. If C-0 does not work for you, then you are likely running Emacs in a terminal. Most terminals do not recognise C-0 as a key combination. In a terminal, you should type C-u 0 c, as you mentioned, or alternatively M-0 c. I have updated the article Emacs Info Expressions to include this detail.

About the article URL, you are right. I had inadvertently renamed the article file. I have now fixed it and the article is now available at emacs-info-expressions.html again. Thank you for reporting this issue.

12 May 2026 00:42 UTC | #7 of 7 comments