March 2009 Archives | Musings

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Austin Weather^#

Today

Severe Tstms
High: 92°F
PoP: 39%

Tonight

Severe Tstms
Low: 72°F
PoP: 15%

Tomorrow

Hot
High: 97°F
PoP: 3%

Tomorrow Night

Partly Cloudy
Low: 71°F
PoP: 2%

Currently:

A Few Clouds, 82.0°F (27.8°C)
(Doppler Radar)

MathML

$MathML logo$ Posts with this logo use MathML. To see the equations, you either need Mozilla or a MathML plugin for IE/Win. You will also need to install some fonts. The posts were authored in itex (an extension of WebTeX) using the itexToMML Text Filter plugin for MovableType (the README file).

Calendar

March 2009's Entries

Fun (With) Video
- Mar 2, 2009
- Fantastic fingering ferrofluids.

Random Past Entries

Uncertainty
- Sep 16, 2012
- Some meandering notes on measurement in Quantum Mechanics
Collinear
- Sep 27, 2004
- A lot of people (myself included) got very excited by the fact that perturbative N=4N=4 super Yang-Mills amplitudes seemed…
So much for Unicode!
- May 6, 2007
- Slashed letters (the Dirac operator, etc) in itex2MML.
Best. Spam. Ever.
- Sep 19, 2004
- Paging Tom Ridge!
No Content
- Nov 21, 2002
- According to the new tool, GetContentSize, the main page of this blog is a whopping 30% “content”. I know… it…

MT How-To

Validating Comments
- May 3, 2003
- Run comments through the W3C Validator before posting. The first in a series of “How-To” articles on MovableType.
Bullet-Proofing II
- May 11, 2003
- More bullet-proofing tips to ensure your blog is valid XHTML
Text Filters for Comments
- May 19, 2003
- Allow a choice of Text Filters in your Comment-entry form.
Serve it Up!
- May 26, 2003
- Serving your blog as XHTML 1.1 with a MIME-type of application/xhtml+xml.
<abbr>, <acronym>, Accessibility & ...
- Sep 10, 2003
- A tutorial on marking up abbreviations and an MT plugin which makes the job easy.
Forcing Comment Previews
- Jun 16, 2004
- Introducing the MTHash plugin, and a reliable way to force Comment Previews.
Internationalization and Trackbacks
- Feb 17, 2005
- In which our hero gets fed up with gibberish Trackbacks and takes matters in his own hands.

Recent Comments

Brotli (1)
- FurriousFox
  - Mar 28, 2023 11:24
  - hmm, but now you got the issue that if you send a request with if-none-match: “0-5debc62fd30dd-br” it’ll respond with etag: ...

Fine Structure (2)
- Jacques Distler
  - Oct 18, 2022 10:40
  - Quantum I and II are (roughly) the first and second half of Griffiths’ book.
- Dave
  - Oct 17, 2022 23:52
  - Just out of curiosity, what book are you using/recommending for the course (if you’re using any)?

MathML Update (8)
- Jacques Distler
  - Jul 24, 2022 14:53
  - That’s because I turned off sending the Content-Security-Policy header. It clearly doesn’t affect the loading of other Javascript, but does ...
- Mitchell Porter
  - Jul 24, 2022 14:38
  - It’s all working everywhere now!
- Jacques Distler
  - Jul 24, 2022 01:14
  - The browsers you list all use MathJax to render the formulæ. But so does Chrome on a Mac, and that ...
- Jacques Distler
  - Jul 23, 2022 15:25
  - Is it just my blog, or is the n-Category Café also affected? The browsers you list all use MathJax to ...
- Mitchell Porter
  - Jul 23, 2022 14:26
  - Chrome and Microsoft Edge under Windows, Chrome under Android. They all still show the same problem, the markup is displayed ...

Action-Angle Variables (26)
- Jacques Distler
  - May 5, 2022 11:24
  - That is: your homology basis γ i\gamma_i are the boundaries of disks, γ i=∂D i\gamma_i = \partial D_i. That sounds ...
- Leo Stein
  - May 5, 2022 10:29
  - I know this is extremely late, but I just stumbled on this post recently. In the setting where your symplectic ...
- Matthew Kvalheim
  - Apr 14, 2018 20:23
  - Sorry — when I said “global”, what I really meant was globally on defined on a torus or on a ...
- Jacques Distler
  - Apr 14, 2018 20:06
  - But then there is the question: why do the local 1-forms dφ id\varphi^i patch together to yield well-defined global 1-forms? ...
- Matthew Kvalheim
  - Apr 14, 2018 18:57
  - Interesting. I didn’t know that result. Thanks for the reference. Using that result, given (K 1,…,K n)(K_1,\ldots,K_n), we can locally ...

Entanglement for Laymen (12)
- Robert
  - Mar 19, 2022 10:07
  - I guess what I was trying to say was that when you allow hidden variables, entanglement can still look like ...
- Jacques Distler
  - Mar 18, 2022 04:01
  - Fair enough. I wasn’t trying to rule out hidden variable theories (which, if you are willing to entertain sufficiently baroque ...
- Robert
  - Mar 18, 2022 03:47
  - I guess, I am a bit late for the party, but haven’t been here for several years, sorry. In fact, ...
- Sidney
  - May 15, 2020 15:06
  - This example is very useful ! I still don’t fully grasp the distinction between what the filter does (absorbing photons) ...
- Jacques Distler
  - May 12, 2020 16:01
  - This criteria makes sense indeed, is it correct to interpret it as an “action at distance” ? No more than ...

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March 2, 2009

Fun (With) Video

Been rather busy with other matters, but I thought I would share a cool little physics video with you.

Continue reading “Fun (With) Video” ...

Posted by distler at 10:17 AM | Permalink | Followups (17)