removing all categories

I don't really need those hashtags, and they just slow down the site generation.

25 files changed, 25 insertions, 25 deletions

diff --git a/source/_posts/2014-10-20-hello-octopress.md b/source/_posts/2014-10-20-hello-octopress.md
index 8a5ba259..d359f401 100644
--- a/source/_posts/2014-10-20-hello-octopress.md
+++ b/source/_posts/2014-10-20-hello-octopress.md
@@ -3,7 +3,7 @@ layout: post
 title: "Hello, Octopress!"
 date: 2014-10-20 16:53:00 -0700
 comments: true
-categories: ['first post', 'octopress', 'tumblr']
+categories:
 ---
 This post marks my transition from Tumblr to Octopress & GitHub Pages.
 
diff --git a/source/_posts/2014-10-20-help-mou-hit-1-dot-0.md b/source/_posts/2014-10-20-help-mou-hit-1-dot-0.md
index 1b519749..22587df4 100644
--- a/source/_posts/2014-10-20-help-mou-hit-1-dot-0.md
+++ b/source/_posts/2014-10-20-help-mou-hit-1-dot-0.md
@@ -3,7 +3,7 @@ layout: post
 title: "Help Mou hit 1.0"
 date: 2014-10-20 17:37:45 -0700
 comments: true
-categories: [markdown, mou, text editor, indiegogo, fundraiser]
+categories:
 ---
 Quick call for [Mou 1.0 fundraiser](https://www.indiegogo.com/projects/mou-1-0-markdown-editor-on-os-x-for-you) on Indiegogo. At the time of writing, it has raised $6,178/$20,000, and has 39 days to go (with 21 already passed).
 
diff --git a/source/_posts/2014-10-21-get-rolling.md b/source/_posts/2014-10-21-get-rolling.md
index 554647f7..bf8f040e 100644
--- a/source/_posts/2014-10-21-get-rolling.md
+++ b/source/_posts/2014-10-21-get-rolling.md
@@ -3,7 +3,7 @@ layout: post
 title: "Get rolling"
 date: 2014-10-21 11:40:14 -0700
 comments: true
-categories: [life, philosophy, opinion]
+categories:
 ---
 Yesterday, on an internet forum, I saw someone’s signature, which translates to
 
diff --git a/source/_posts/2014-10-23-ripping-copy-protected-dvd-with-mpv.md b/source/_posts/2014-10-23-ripping-copy-protected-dvd-with-mpv.md
index 09da7206..4db51a86 100644
--- a/source/_posts/2014-10-23-ripping-copy-protected-dvd-with-mpv.md
+++ b/source/_posts/2014-10-23-ripping-copy-protected-dvd-with-mpv.md
@@ -3,7 +3,7 @@ layout: post
 title: "Ripping copy-protected DVD with mpv"
 date: 2014-10-23 20:03:22 -0700
 comments: true
-categories:  [video, ffmpeg, mpv, mplayer, dvd, transcoding, copyright, drm]
+categories:
 ---
 **_11/02/2014 update:_**
 
diff --git a/source/_posts/2014-10-24-charles-munger-donated-$65m-to-kitp.md b/source/_posts/2014-10-24-charles-munger-donated-$65m-to-kitp.md
index 45cc4d38..9c37b99e 100644
--- a/source/_posts/2014-10-24-charles-munger-donated-$65m-to-kitp.md
+++ b/source/_posts/2014-10-24-charles-munger-donated-$65m-to-kitp.md
@@ -3,7 +3,7 @@ layout: post
 title: "Charles Munger donated $65M to KITP"
 date: 2014-10-24 16:41:36 -0700
 comments: true
-categories: [news, physics, funding, business, math, mathematician, physicist]
+categories:
 ---
 Today's news has it that Charles Munger made a $65 million donation to KITP at UCSB. See for instance [this article](http://nyti.ms/1D4zg24) on NYT. Of course I didn't learn it from NYT (I'm generally sick of any news other than math, physics, or IT-related ones). I learned it from [Not Even Wrong](http://www.math.columbia.edu/~woit/wordpress/?p=7247) instead (of course I don't agree with Woit, but some of his links are nice).
 
diff --git a/source/_posts/2014-10-25-os-x-package-receipts.md b/source/_posts/2014-10-25-os-x-package-receipts.md
index ab10d83f..a3695600 100644
--- a/source/_posts/2014-10-25-os-x-package-receipts.md
+++ b/source/_posts/2014-10-25-os-x-package-receipts.md
@@ -3,7 +3,7 @@ layout: post
 title: "OS X package receipts"
 date: 2014-10-25 13:26:02 -0700
 comments: true
-categories: [os x, package, install, uninstall]
+categories:
 ---
 I just learned something new. Whenever you install a `pkg` on OS X, OS X stores a receipt of what was installed in `/var/db/receipts` (I'm running OS X 10.9.5 at the time of writing), called a **bom** — bill of materials (I’d rather call it a manifest, whatever). This feature was introduced in NeXTSTEP. From `man 5 bom`:
 
diff --git a/source/_posts/2014-10-26-audio-cd-slash-dvd-to-iso-image-on-os-x.md b/source/_posts/2014-10-26-audio-cd-slash-dvd-to-iso-image-on-os-x.md
index c9b54453..7ff57bc8 100644
--- a/source/_posts/2014-10-26-audio-cd-slash-dvd-to-iso-image-on-os-x.md
+++ b/source/_posts/2014-10-26-audio-cd-slash-dvd-to-iso-image-on-os-x.md
@@ -3,7 +3,7 @@ layout: post
 title: "Convert Audio CD/DVD to ISO image on OS X"
 date: 2014-10-26 23:29:47 -0700
 comments: true
-categories: [cd, dvd, iso, image, disk, diskutil, hdiutil, 'os x', filesystem, music]
+categories:
 ---
 **_11/02/2014 update:_**
 
diff --git a/source/_posts/2014-10-26-disk-visualizer-daisydisk.md b/source/_posts/2014-10-26-disk-visualizer-daisydisk.md
index abd67fc8..2de4201e 100644
--- a/source/_posts/2014-10-26-disk-visualizer-daisydisk.md
+++ b/source/_posts/2014-10-26-disk-visualizer-daisydisk.md
@@ -3,7 +3,7 @@ layout: post
 title: "Disk visualizer: DaisyDisk"
 date: 2014-10-26 00:02:22 -0700
 comments: true
-categories: [software, app, application, disk, diskutil, storage, drive, MAS, 'Mac App Store']
+categories:
 ---
 DaisyDisk is a pretty famous name. I’ve heard a lot that DaisyDisk is beautiful, but as a “power user” I always feel ashamed about using a disk analyzer or visualizer (although no one really cares). I’m pretty comfortable with doing most filesystem operations right in the shell, and for other tasks too tedious for the shell (like renaming a bunch of files with no obvious pattern), Finder (equipped with TotalFinder) works just fine.
 
diff --git a/source/_posts/2014-10-27-onedrive-goes-unlimited.md b/source/_posts/2014-10-27-onedrive-goes-unlimited.md
index d2b23667..256b04e6 100644
--- a/source/_posts/2014-10-27-onedrive-goes-unlimited.md
+++ b/source/_posts/2014-10-27-onedrive-goes-unlimited.md
@@ -3,7 +3,7 @@ layout: post
 title: "OneDrive goes unlimited"
 date: 2014-10-27 09:44:51 -0700
 comments: true
-categories: [onedrive, 'google drive', icloud, storage, office, 'office 365', microsoft, apple, google]
+categories:
 ---
 **10/28/2014 Update:**
 
diff --git a/source/_posts/2014-10-28-google-drive-no-selective-subfolder-sync.md b/source/_posts/2014-10-28-google-drive-no-selective-subfolder-sync.md
index db7e0d59..2383a0da 100644
--- a/source/_posts/2014-10-28-google-drive-no-selective-subfolder-sync.md
+++ b/source/_posts/2014-10-28-google-drive-no-selective-subfolder-sync.md
@@ -3,7 +3,7 @@ layout: post
 title: "Google Drive — no selective subfolder sync?"
 date: 2014-10-28 20:49:24 -0700
 comments: true
-categories: ['google drive', onedrive, storage, 'online storage', dropbox]
+categories:
 ---
 Up to this point I've been using Google Drive as an online backup service, and uploads files mostly manually, although I do sync `~/img` with the client.
 
diff --git a/source/_posts/2014-10-28-mou-1-dot-0-fundraiser-goal-reached.md b/source/_posts/2014-10-28-mou-1-dot-0-fundraiser-goal-reached.md
index ad9c4fda..bec69ef7 100644
--- a/source/_posts/2014-10-28-mou-1-dot-0-fundraiser-goal-reached.md
+++ b/source/_posts/2014-10-28-mou-1-dot-0-fundraiser-goal-reached.md
@@ -3,7 +3,7 @@ layout: post
 title: "Mou 1.0 fundraiser: goal reached"
 date: 2014-10-28 01:57:06 -0700
 comments: true
-categories: [mou, markdown, funding, fundraiser, indiegogo]
+categories:
 ---
 A week ago I wrote a post [*Help Mou hit 1.0*](blog/2014/10/20/help-mou-hit-1-dot-0/). Today, I'm delighted to find out that Mou has reached its goal, $20,000, half way into the fundraiser.
 
diff --git a/source/_posts/2014-10-29-fun.md b/source/_posts/2014-10-29-fun.md
index 74c8424f..ce32a9b0 100644
--- a/source/_posts/2014-10-29-fun.md
+++ b/source/_posts/2014-10-29-fun.md
@@ -3,7 +3,7 @@ layout: post
 title: "Fun"
 date: 2014-10-29 11:26:29 -0700
 comments: true
-categories: [fun, stanford, math, mathematician]
+categories:
 ---
 
 This happened in yesterday's Math 210A lecture.
diff --git a/source/_posts/2014-11-02-vobcopy-dvdbackup-etc.md b/source/_posts/2014-11-02-vobcopy-dvdbackup-etc.md
index 97359821..b8690912 100644
--- a/source/_posts/2014-11-02-vobcopy-dvdbackup-etc.md
+++ b/source/_posts/2014-11-02-vobcopy-dvdbackup-etc.md
@@ -3,7 +3,7 @@ layout: post
 title: "vobcopy, dvdbackup, etc."
 date: 2014-11-02 15:06:07 -0800
 comments: true
-categories: [cd, dvd, vob, video, filesystem, 'os x', music, hdiutil]
+categories:
 ---
 A few days ago, I was cloning my entire Audio CD and DVD collection, and reported some of the findings in [this post](/blog/2014/10/26/audio-cd-slash-dvd-to-iso-image-on-os-x/). As said, the most important commands are
 
diff --git a/source/_posts/2014-11-05-apple-is-pushing-yosemite-hard.md b/source/_posts/2014-11-05-apple-is-pushing-yosemite-hard.md
index 2e06c573..0324c26c 100644
--- a/source/_posts/2014-11-05-apple-is-pushing-yosemite-hard.md
+++ b/source/_posts/2014-11-05-apple-is-pushing-yosemite-hard.md
@@ -3,7 +3,7 @@ layout: post
 title: "Apple is pushing Yosemite hard"
 date: 2014-11-05 22:17:01 -0800
 comments: true
-categories: [apple, 'os x', yosemite, 'os x yosemite', software, update, upgrade, thought, imac, macbook pro, retina]
+categories:
 ---
 Apple is pushing Yosemite hard and secretly Yosemitizing things. iTunes was updated to its shiny new look on Mavericks, day one upon Yosemite launch. I liked it. The only problems I had with the new iTunes are:
 
diff --git a/source/_posts/2014-11-05-list-youtube-playlist-with-youtube-dl.md b/source/_posts/2014-11-05-list-youtube-playlist-with-youtube-dl.md
index d82edf75..a0d8af7b 100644
--- a/source/_posts/2014-11-05-list-youtube-playlist-with-youtube-dl.md
+++ b/source/_posts/2014-11-05-list-youtube-playlist-with-youtube-dl.md
@@ -3,7 +3,7 @@ layout: post
 title: "List YouTube playlist with youtube-dl"
 date: 2014-11-05 10:37:58 -0800
 comments: true
-categories: [youtube, video, 'web scraping']
+categories:
 ---
 Of course you are always welcome to use the [Google APIs Client Library for Python](https://developers.google.com/api-client-library/python/) to wrestle with YouTube, which is usually pretty simple. (As an added bonus, YouTube has some [nice runnable sample scripts](https://developers.google.com/youtube/v3/code_samples/) to get you started.) With the client library, listing videos in a YouTube playlist is a breeze.
 
diff --git a/source/_posts/2014-11-06-2014-nobel-prize-in-physics-led-lights-seriously.md b/source/_posts/2014-11-06-2014-nobel-prize-in-physics-led-lights-seriously.md
index a9f27ae8..f68ea55d 100644
--- a/source/_posts/2014-11-06-2014-nobel-prize-in-physics-led-lights-seriously.md
+++ b/source/_posts/2014-11-06-2014-nobel-prize-in-physics-led-lights-seriously.md
@@ -3,7 +3,7 @@ layout: post
 title: "2014 Nobel Prize in Physics — LED lights, seriously?"
 date: 2014-11-06 11:08:45 -0800
 comments: true
-categories: [physics, nobel, physicists]
+categories:
 ---
 For some reason, I only learned about this year’s laureates today, through [the reference frame](http://motls.blogspot.com/2014/11/ex-employer-wont-meet-blue-led-nobel.html). The prize goes to the inventors of the LED. Not exciting at all, so I don’t care if I’m ever informed. (Lubos has a good point on why applied physics — well, let’s even widen the concept of applied physics a bit — should not surprise anyone when they appear in a Nobel Prize announcement: “After all, Alfred Nobel might have very well considered his dynamite to be a discovery in physics, too.”)
 
diff --git a/source/_posts/2014-11-07-interstellar.md b/source/_posts/2014-11-07-interstellar.md
index 681e4a70..8cd93b8f 100644
--- a/source/_posts/2014-11-07-interstellar.md
+++ b/source/_posts/2014-11-07-interstellar.md
@@ -3,7 +3,7 @@ layout: post
 title: "Interstellar"
 date: 2014-11-07 23:56:31 -0800
 comments: true
-categories: [movie, review, sci-fi, physics, relativity, gravity]
+categories:
 ---
 Today (I mean November 7, 2014 — it’s technically November 8 at the time of writing) I saw [*Interstellar*](https://en.wikipedia.org/wiki/Interstellar_%28film%29) (IMAX digital) at AMC Mercado 20. I rarely go to movie theaters, less on the release day (film formats of *Interstellar* were released on November 5, and digital formats followed on November 7). However, reviews of it were positive (from the physics community), and I really need a way to release stress these days — I wasn’t in the right condition for months. So I figured I’d just spend an afternoon in front of the big screen.
 
diff --git a/source/_posts/2014-11-10-average-phone-plan-in-the-u-dot-s-costs-ten-time-as-much-as-that-in-the-u-dot-k.md b/source/_posts/2014-11-10-average-phone-plan-in-the-u-dot-s-costs-ten-time-as-much-as-that-in-the-u-dot-k.md
index 0bf68da9..1bce5027 100644
--- a/source/_posts/2014-11-10-average-phone-plan-in-the-u-dot-s-costs-ten-time-as-much-as-that-in-the-u-dot-k.md
+++ b/source/_posts/2014-11-10-average-phone-plan-in-the-u-dot-s-costs-ten-time-as-much-as-that-in-the-u-dot-k.md
@@ -3,7 +3,7 @@ layout: post
 title: "Average phone plan in the U.S. costs ten time as much as that in the U.K."
 date: 2014-11-10 11:11:46 -0800
 comments: true
-categories: [phone, mobile, data, pricing]
+categories:
 ---
 To quote [Opera News](http://blogs.opera.com/news/2014/11/mobile-data-anyway/),
 
diff --git a/source/_posts/2014-11-11-re-encoding-everything-for-iphone-6-plus.md b/source/_posts/2014-11-11-re-encoding-everything-for-iphone-6-plus.md
index d0d9ccf7..51d5ed37 100644
--- a/source/_posts/2014-11-11-re-encoding-everything-for-iphone-6-plus.md
+++ b/source/_posts/2014-11-11-re-encoding-everything-for-iphone-6-plus.md
@@ -3,6 +3,6 @@ layout: post
 title: "Re-encoding everything for iPhone 6 Plus"
 date: 2014-11-11 13:31:25 -0800
 comments: true
-categories: [phone, iphone, display, screen, retina, video, h.264, encode, ffmpeg]
+categories:
 ---
 AT&T finally delivered my iPhone 6 Plus (silver, 64 GB) after about fifty days since preorder… The 1080p Retina display is simply stunning. However, it turns out that my old videos don’t work so well on 6 Plus’s giant screen. My old mobile video collection was optimized for my 16 GB 4S, targeting the small screen and highly limited storage — you guessed it, they were resized to 960x540, and they looked great. But they’re not up to the task any more. 960x540 videos aren’t at all sharp on the stunning screen of 6 Plus, which is more than capable of handling 4x pixels. Therefore, I have no choice but to feed it more pixels. I’m left in a weird situation, where my 1080p desktop (or even HDTV) quality videos should fit the screen just fine, but H.264 profile stands in the way. iPhone 6 and 6 Plus are only capable of High Profile level 4.2, so anything encoded in level 5.1, for instance, needs to be re-encoded. Also there are still MPEG-2 and MPEG-4 videos out there (MPEG-4 should be obsolete by now, I assume, but some people still use it; and MPEG-2 is de facto in TV broadcasts), which have to be transcoded. Okay, it’s a daunting task to re-encode a fairly big collection, but I have to do it sooner or later. Presumably this weekend. I’ll also report whether 720p videos look sharp on the screen later.
diff --git a/source/_posts/2014-11-19-convolution-of-irreducible-characters.md b/source/_posts/2014-11-19-convolution-of-irreducible-characters.md
index 1176091a..601ee9f7 100644
--- a/source/_posts/2014-11-19-convolution-of-irreducible-characters.md
+++ b/source/_posts/2014-11-19-convolution-of-irreducible-characters.md
@@ -3,7 +3,7 @@ layout: post
 title: "Convolution of irreducible characters"
 date: 2014-11-19 20:40:37 -0800
 comments: true
-categories: [math, expository, 'representation theory', algebra]
+categories:
 ---
 __*TL; DR:* The actual PDF write-up is [here](/pdf/20141119-convolution-of-irreducible-characters.pdf).__
 
diff --git a/source/_posts/2014-11-20-dropbot-for-geeks(r).md b/source/_posts/2014-11-20-dropbot-for-geeks(r).md
index 3c5c86cb..ad075302 100644
--- a/source/_posts/2014-11-20-dropbot-for-geeks(r).md
+++ b/source/_posts/2014-11-20-dropbot-for-geeks(r).md
@@ -3,7 +3,7 @@ layout: post
 title: "Dropbot for Geeks®"
 date: 2014-11-20 09:48:15 -0800
 comments: true
-categories: [cloud, storage, sync, unix, geek, daydream, patent, fun]
+categories:
 ---
 I propose the following cloud storage and syncing service model of the future. I call it **Dropbot for Geeks®**, and it totally rules. It's designed for geeks who are tired of the highly limited, miserably unproductive traditional services (based on clicking around). It has the following features:
 
diff --git a/source/_posts/2014-11-24-iphone-photography-frustration.md b/source/_posts/2014-11-24-iphone-photography-frustration.md
index 8a425aca..1a375f25 100644
--- a/source/_posts/2014-11-24-iphone-photography-frustration.md
+++ b/source/_posts/2014-11-24-iphone-photography-frustration.md
@@ -3,7 +3,7 @@ layout: post
 title: "iPhone photography frustration"
 date: 2014-11-24 12:42:25 -0800
 comments: true
-categories: [iphone, apple, photo, photography, 'image editing', adobe, annoyance, 'os x', yosemite]
+categories:
 ---
 **TL; DR:** Jump to the paragraph “In the end…”
 
diff --git a/source/_posts/2014-11-24-why-i-abandoned-mathjax-and-fell-back-to-pdf.md b/source/_posts/2014-11-24-why-i-abandoned-mathjax-and-fell-back-to-pdf.md
index 098b7bcc..10f105d8 100644
--- a/source/_posts/2014-11-24-why-i-abandoned-mathjax-and-fell-back-to-pdf.md
+++ b/source/_posts/2014-11-24-why-i-abandoned-mathjax-and-fell-back-to-pdf.md
@@ -3,7 +3,7 @@ layout: post
 title: "Why I abandoned MathJax and fell back to PDF"
 date: 2014-11-24 20:54:36 -0800
 comments: true
-categories: [math, mathjax, latex, html, markdown, pandoc]
+categories:
 ---
 Recently I wrote an expository article, [*Convolution of irreducible characters*](/pdf/20141119-convolution-of-irreducible-characters.pdf), and posted it [here](/blog/2014/11/19/convolution-of-irreducible-characters/). At first I intended to use MathJax, but in the end I fell back to good ol' PDF. Here's why.
 
diff --git a/source/_posts/2014-11-25-i-got-16-gigs-of-ram.md b/source/_posts/2014-11-25-i-got-16-gigs-of-ram.md
index 81c38d9d..d55a642e 100644
--- a/source/_posts/2014-11-25-i-got-16-gigs-of-ram.md
+++ b/source/_posts/2014-11-25-i-got-16-gigs-of-ram.md
@@ -3,7 +3,7 @@ layout: post
 title: "I got 16 gigs of RAM"
 date: 2014-11-25 16:28:30 -0800
 comments: true
-categories: 
+categories:
 ---
 Today I upgraded the RAM of my MacBook Pro mid-2012 to 2x8GB. I purchased the [Crucial 16GB Kit (8GBx2) DDR3/DDR3L 1600 MHz (PC3-12800) CL11 SODIMM 204-Pin 1.35V/1.5V Memory for Mac CT2K8G3S160BM](http://smile.amazon.com/dp/B008LTBJFW) from Amazon, which cose me $146.64 after tax. I followed the [official guide](http://support.apple.com/en-us/HT201165) as well as the [iFixit guide](https://www.ifixit.com/Guide/MacBook+Pro+13-Inch+Unibody+Mid+2012+RAM+Replacement/10374). To finish the job I needed a Phillips #00 screwdriver and a spudger, so I purchased the [spudger](https://www.ifixit.com/Store/Tools/Spudger/IF145-002) and the [54 bit driver kit](https://www.ifixit.com/Store/Tools/54-Bit-Driver-Kit/IF145-022-1) from iFixit.
 
diff --git a/source/_posts/2014-11-26-original-images-in-day-one-journal.md b/source/_posts/2014-11-26-original-images-in-day-one-journal.md
index 65293464..c738699c 100644
--- a/source/_posts/2014-11-26-original-images-in-day-one-journal.md
+++ b/source/_posts/2014-11-26-original-images-in-day-one-journal.md
@@ -3,7 +3,7 @@ layout: post
 title: "Original images in Day One journal"
 date: 2014-11-26 00:22:16 -0800
 comments: true
-categories: ['day one', journal, image, photo, png, jpg]
+categories:
 ---
 **TL; DR:** Jump to the paragraph beginning with “workaround”.