Hackers' Pub

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`"` keyword `"`	Finds the string within quotes, including spaces. Case-insensitive. (Escape quotes inside with `\"`)	`"Hackers' Pub"`
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`#` tag	Finds content with the specified tag. Case-insensitive.	`#HackersPub`
condition condition	Finds content that satisfies both conditions on either side of the space (logical AND).	`"Hackers' Pub" lang:en`
condition `OR` condition	Finds content that satisfies at least one of the conditions on either side of the OR operator (logical OR).	`#HackersPub OR "Hackers' Pub" lang:en`
`(` condition `)`	Combines the operators within the parentheses first.	`(#HackersPub OR "Hackers' Pub" OR "Hackers Pub") lang:en`

Stephen Brooks 🦆 @sjb@mstdn.io

3/16/2026, 9:52:15 PM

Public

@dpiponiDan Piponi I was reading about this today:
https://en.wikipedia.org/wiki/Linear_canonical_transformation
This helps generalise some of the fractional Fourier transform ideas by associating them with a 2x2 matrix in time-frequency space.

What I find interesting here is that the Wigner function is trying to approximately expand in two (very different) bases at once, which is impossible but it's doing the best it can. Then these transformations are allowing manipulation of the direct product space of the two bases.

Linear canonical transformation - Wikipedia

en.wikipedia.org

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