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Index
Many of the results in this chapter are informal and geometrical, and do not follow
logically from our assumptions. I will freely use properties of similar triangles,
parallelograms, and trigonometric functions. Some of the results (e.g., those
involving trigonometric identities) will be rederived later in a more rigorous form.
Every statement labeled Theorem or Definition is part of our logical
development.
Subsections