David Y. Zhang dmonopoly

Mathematics: What do grad students in math do all day?

A lot of math grad school is reading books and papers and trying to understand what's going on. The difficulty is that reading math is not like reading a mystery thriller, and it's not even like reading a history book or a New York Times article.

The main issue is that, by the time you get to the frontiers of math, the words to describe the concepts don't really exist yet. Communicating these ideas is a bit like trying to explain a vacuum cleaner to someone who has never seen one, except you're only allowed to use words that are four letters long or shorter.

What can you say?

tmux cheatsheet

As configured in my dotfiles.

start new:

tmux

start new with session name:

Sublime Text 2 – Useful Shortcuts (Mac OS X)

General

⌘T	go to file
⌘⌃P	go to project
⌘R	go to methods
⌃G	go to line
⌘KB	toggle side bar
⌘⇧P	command prompt

Install Rails 3.1 RC

gem install rails --pre

generate new app, skipping Test::Unit file generation

rails new my_app -T

	#include <string>
	#include <vector>
	#include <algorithm>

	using namespace std;

	struct One {
	string name;
	vector<string> values;
	};

	#!/bin/bash

	# Script for installing tmux on systems where you don't have root access.
	# tmux will be installed in $HOME/local/bin.
	# It's assumed that wget and a C/C++ compiler are installed.

	# exit on error
	set -e

	TMUX_VERSION=1.8

	### INSTALLATION NOTES ###
	# 1. Install Homebrew (https://github.com/mxcl/homebrew)
	# 2. brew install zsh
	# 3. Install OhMyZsh (https://github.com/robbyrussell/oh-my-zsh)
	# 4. brew install reattach-to-user-namespace --wrap-pbcopy-pbpaste && brew link reattach-to-user-namespace
	# 5. Install iTerm2
	# 6. In iTerm2 preferences for your profile set:
	# Character Encoding: Unicode (UTF-8)
	# Report Terminal Type: xterm-256color
	# 7. Put itunesartist and itunestrack into PATH

	$('#book').animate({
	opacity: 0.25,
	left: '+=50',
	height: 'toggle'
	}, 5000, function() {
	// Animation complete.
	});

	# add this to your spec helper
	RSpec.configure do \|config\|
	config.treat_symbols_as_metadata_keys_with_true_values = true
	config.filter_run :focus => true
	config.run_all_when_everything_filtered = true
	end

	# and then use the :focus tag in your specs

	it "does something awesome", :focus do

	irb(main):004:0> Teacher.find_by_id(49)
	Teacher Load (0.3ms) SELECT "teachers".* FROM "teachers" WHERE "teachers"."id" = 49 LIMIT 1
	=> #<Teacher id: 49, name: "Sam Rice", bio: nil, email: nil, created_at: "2011-06-22 21:03:41", updated_at: "2011-06-22 21:03:41", pic_file_name: nil, pic_content_type: nil, pic_file_size: nil, pic_updated_at: nil>

	irb(main):007:0> Teacher.find_by_name("Sam Rice")
	Teacher Load (0.3ms) SELECT "teachers".* FROM "teachers" WHERE "teachers"."name" = 'Sam Rice' LIMIT 1
	=> nil