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For Ideas & Basics
Extensive math resource introducing concepts of all kinds.
Geometry in Action
This page collects various areas in which ideas from discrete and computational geometry (meaning mainly low-dimensional Euclidean geometry) meet some real world applications. It contains brief descriptions of those applications and the geometric questions arising from them, as well as pointers to web pages on the applications themselves and on their geometric connections.
You already know it and love it. Don't get it twisted: this still isn't an appropriate source for your final product. But for getting ideas to bounce around? Go for it!
Useful when you're starting out on a research project. Do simple searches to find topic introductions in a variety of subjects. The mind map tool will help you discover related ideas and terms.