André Albuquerque amalbuquerque

These links no longer work. Springer have pulled the free plug.

Graduate texts in mathematics

duplicates = multiple editions

A Classical Introduction to Modern Number Theory, Kenneth Ireland Michael Rosen

Let's solve the following physics problem using Symbolism, a computer algebra library for C#.

One strategy in a snowball fight is to throw a first snowball at a high angle over level ground. While your opponent is watching the first one, you throw a second one at a low angle and timed to arrive at your opponent before or at the same time as the first one.

Assume both snowballs are thrown with a speed of 25.0 m/s.

The first one is thrown at an angle of 70.0° with respect to the horizontal.

tmux shortcuts & cheatsheet

start new:

tmux

start new with session name:

tmux new -s myname

Multiple SSH Keys settings for different github account

create different public key

create different ssh key according the article Mac Set-Up Git

$ ssh-keygen -t rsa -C "[email protected]"

	__author__ = 'dkarchmer'
	'''
	This script emulates a stand-alone Python based client. It relies on Boto3 to access AWS, but
	requires your Django server to have an API for your user to access Cognito based credentials

	Because of Cognito, the client (this script) will only get temporary AWS credentials associated
	to your user and only your user, and based on whatever you configure your AIM Policy to be.

	Most Cognito examples demonstrate how to use Cognito for Mobile Apps, so this scripts demonstrate
	how to create a stand-alone Python script but operating similarly to these apps.

	defmodule Bumper do

	@doc ~S"""
	Reads a Bitmap (24-bit) and displays width, height, and the RGB of each pixel
	"""
	def show(filename) do
	{:ok, bindata} = File.read(filename)
	<< "BM",
	_::size(64),
	offset_to_pixels::size(32)-little,

	#!/usr/bin/env node

	/*
	* Inspired by: http://stackoverflow.com/questions/4360060/video-streaming-with-html-5-via-node-js
	* Modified from https://gist.github.com/paolorossi/1993068
	*/

	var http = require('http')
	, fs = require('fs')
	, util = require('util')

	#include <X11/Xlib.h>
	#include <stdio.h>
	#include <stdlib.h>

	int main()
	{
	Display *display;
	Window window;
	XEvent event;
	int s;