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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

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

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OS X Screencast to animated GIF

This gist shows how to create a GIF screencast using only free OS X tools: QuickTime, ffmpeg, and gifsicle.

Instructions

To capture the video (filesize: 19MB), using the free "QuickTime Player" application:

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#!/bin/bash

# Path to the BKLibrary file
BKLIBRARY_PATH=~/Library/Containers/com.apple.iBooksX/Data/Documents/BKLibrary

# Check if BKLibrary file exists
if [ ! -f "$BKLIBRARY_PATH/BKLibrary-"*".sqlite" ]; then
    echo "BKLibrary file not found. Please make sure Books app is installed and has been opened at least once."
    exit 1
fi