Updated.

- added mathjax (freed)
- added rss.py
- updated publish.el
- etc.

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+#+title: Yuchen Pei
+
+Hello! I am Yuchen. You have reached my personal website.
+
+I am a programmer, mathematician and free software advocate.
+
+I did a PhD at the [[https://warwick.ac.uk/fac/sci/masdoc][MASDOC program at Warwick]], and spent two years in a postdoc position at [[http://cmsa.fas.harvard.edu][CMSA at Harvard]] and another one and a half years at the [[https://www.math.kth.se/RMSMA/][KTH RMSMA group]]. After that I worked as a full stack web developer for two years.
+
+I am an associate member and licensing volunteer of the [[https://fsf.org][Free Software Foundation]], and have applied the philosophy of free software to knowledge and research. For example I shared my research in Robinson-Schensted algorithms as a [[https://toywiki.xyz][wiki]] under a free Creative Commons license. I believe anyone can be an academic, seeking truth and sharing their findings with the public.
+
+I can be reached at: hi@[the domain of this site] (PGP key: 47F9 D050 1E11 8879 9040  4941 2126 7E93 EF86 DFD0). Feel free to email me, whether you know me or not.
+
+Views expressed on this website do not represent those of my past, present or future employers or associates.
diff --git a/pages/links.org b/pages/links.org
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+#+title: Links
+
+Here are some links I find interesting or helpful, or both. Listed in no
+particular order.
+
+- [[http://worrydream.com/][Bret Victor]]
+- [[https://www.peterkrautzberger.org/archive/][Peter Krautzberger]]
+- [[https://web.stanford.edu/~cpiech/bio/index.html][Chris Piech]]
+- [[https://www.scilag.net/][SciLag]]
+- [[https://satwcomic.com/][Scandinavia and the World]]
+- [[http://www.arxiv-sanity.com/][Arxiv Sanity Preserver]]
+- [[http://www.shortscience.org/][ShortScience.org]]
+- [[https://paperswithcode.com/][Papers with Code]]
+- [[https://distill.pub/][Distill]]
+- [[https://competitions.codalab.org/competitions/][CodaLab]]
+- [[https://haskellformaths.blogspot.com/][HaskellForMaths]]
+- [[http://www.openproblemgarden.org/][Open Problem Garden]]
+- [[http://www.ams.org/open-math-notes][AMS open notes]]
+- [[http://garsia.math.yorku.ca/MPWP/][Macdonald polynomials webpage]]
+- [[https://news.ycombinator.com/][Hacker News]]
+- [[http://arminstraub.com/][Armin Straub]]
+- [[http://www-math.ucdenver.edu/~wcherowi/][Bill Cherowitzo]]
+- [[https://stallman.org/][Richard Stallman]]
+- [[http://www.aaronsw.com/][Aaron Swartz]] - The Internet's own boy
+- [[https://docs.google.com/document/d/10eA5-mCZLSS4MQY5QGb5ewC3VAL6pLkT53V_81ZyitM/preview][False,
+  Misleading, Clickbait-y, and/or Satirical "News" Sources]]
+- [[http://www.math.utah.edu/~jasonu/deala/][Differential Equations &
+  Linear Algebra]] - Lecture notes on the web
+- [[http://wstein.org/][William Stein]] - William Stein, the creator of
+  SageMath
+
+  - [[http://wstein.org/talks/2016-06-sage-bp/][The origins of
+    SageMath]] Stein's BP centenary talk at Harvard
+
+- [[http://www.sagemath.org/][SageMath]] - Open-source maths software
+  system\\
+- [[https://projecteuler.net/][Project Euler]]
+- [[https://blockly-games.appspot.com/about?lang=en][Blockly games]]
+- [[https://jeremykun.com/][Math ∩ Programming]]
+- [[https://www.authorea.com/][Authorea]]
+- [[http://bigdata.show][Big Data]]
+- [[http://fermatslibrary.com/][Fermat's Library]]
+- [[http://www.tricki.org/][Tricki]]
+- [[http://www.ams.org/samplings/feature-column/fc-current.cgi][AMS
+  Feature Column]]
+- [[https://arxiv.org][arXiv]]
+- [[https://terrytao.wordpress.com/][What's new]] - Terence Tao's blog
+- [[https://gowers.wordpress.com/][Gowers's weblog]] - Timothy Gowers's
+  blog
+- [[http://michaelnielsen.org/polymath1/index.php?title=Main_Page][Polymath]] -
+  MMO maths research
+- [[https://oeis.org/][OEIS]] - The On-Line Encyclopedia of Integer
+  Sequences® (OEIS®)
+- +[[http://www.vim.org][Vi IMproved]] - the one true text editor.+ I'm
+  switching to using [[https://www.gnu.org/software/emacs/][GNU Emacs]]
+  now.
+- [[http://regex.alf.nu/][Regex Golf]]
+- [[http://regexcrossword.com/][Regex Crossword]]
+- [[http://archlinux.org][Arch Linux]]
+- [[https://jupyter.org/][Jupyter notebook]] - An open-source notebook
+- Stackexchange sites
+
+  - [[https://mathoverflow.net/][Mathoverflow]]
+  - [[https://math.stackexchange.com/][Mathematics]]
+  - [[https://codegolf.stackexchange.com/][Codegolf]] - The most fun
+    corner of Stackexchange.
+
+- [[http://math.stanford.edu/~bump/][Danial Bump]]
+- [[http://www.math.ubc.ca/~cass/][Bill Casselman]]
diff --git a/pages/notations.org b/pages/notations.org
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+#+title: List of Notations
+
+#+date: 2019-03-15
+
+Here I list meanings of notations that may have not been explained
+elsewhere.
+
+- \(\text{ty}\): type. Given a word \(w \in [n]^\ell\),
+  \(\text{ty} w = (m_1, m_2, ..., m_n)\) where \(m_i\) is the number of
+  \(i\)'s in \(w\). For example
+  \(\text{ty} (1, 2, 2, 1, 4, 2) = (2, 3, 0, 1)\). The definition of
+  \(\text{ty} T\) for a tableau \(T\) is similar.
+- \([n]\): for \(n \in \mathbb N_{>0}\), \([n]\) stands for the set
+  \(\{1, 2, ..., n\}\).
+- \(i : j\): for \(i, j \in \mathbb Z\), \(i : j\) stands for the set
+  \(\{i, i + 1, ..., j\}\), or the sequence \((i, i + 1, ..., j)\),
+  depending on the context.
+- \(k = i : j\): means \(k\) iterates over \(i\), \(i + 1\),..., \(j\).
+  For example \(\sum_{k = 1 : n} a_k := \sum_{k = 1}^n a_k\).
+- \(x_{i : j}\): stands for the set \(\{x_k: k = i : j\}\) or the
+  sequence \((x_i, x_{i + 1}, ..., x_j)\), depending on the context. So
+  are notations like \(f(i : j)\), \(y^{i : j}\) etc.
+- \(\mathbb N\): the set of natural numbers / nonnegative integer
+  numbers \(\{0, 1, 2,...\}\), whereas
+- \(\mathbb N_{>0}\) or \(\mathbb N^+\): Are the set of positive integer
+  numbers.
+- \(x^w\): when both \(x\) and \(w\) are tuples of objects, this means
+  \(\prod_i x_{w_i}\). For example say \(w = (1, 2, 2, 1, 4, 2)\), and
+  \(x = x_{1 : 7}\), then \(x^w = x_1^2 x_2^3 x_4\).
+- \(LHS\), LHS, \(RHS\), RHS: left hand side and right hand side of a
+  formula
+- \(e_i\): the \(i\)th standard basis in a vector space:
+  \(e_i = (0, 0, ..., 0, 1, 0, 0, ...)\) where the sequence is finite or
+  infinite depending on the dimension of the vector space and the \(1\)
+  is the \(i\)th entry and all other entries are \(0\).
+- \(1_{A}(x)\) where \(A\) is a set: an indicator function, which
+  evaluates to \(1\) if \(x \in A\), and \(0\) otherwise.
+- \(1_{p}\): an indicator function, which evaluates to \(1\) if the
+  predicate \(p\) is true and \(0\) otherwise. Example: \(1_{x \in A}\),
+  same as \(1_A(x)\).
+- \(\xi \sim p\): the random variable \(xi\) is distributed according to
+  the probability density function / probability mass function /
+  probability measure \(p\).
+- \(\xi \overset{d}{=} \eta\): the random variables \(\xi\) and \(\eta\)
+  have the same distribution.
+- \(\mathbb E f(\xi)\): expectation of \(f(\xi)\).
+- \(\mathbb P(A)\): probability of event \(A\).
+- \(a \wedge b\): \(\min\{a, b\}\).
+- \(a \vee b\): \(\max\{a, b\}\).
+- \((\alpha)_+\): the positive part of \(\alpha\),
+  i.e. \(\alpha \vee 0\).
+- \((\alpha)_-\): the negative part of \(\alpha\),
+  i.e. \((- \alpha)_+\).