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Plane Geometry - Bruce E. Shapiro

Plane Geometry - Bruce E. Shapiro

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320 APPENDIX A. SYMBOLS USEDAppendix ASymbols Used∧and∨or⇒implies∼ A or ¬Anot A⇐⇒if and only if∀ for all, for every, for each∃there existsNnatural numbersZ, Z + integers, positive integersQ, Q + rationals, positive rationalsR, R + reals, positive realsR 2 , Q 2 real plane, rational planeP Set of all points on the planeCUnit CircleSUnit Sphere∪Union∩Intersection∈is an element of∉not an element ofA ⊂ BA is a subset of BA ⊆ B A is a proper subset of BA − B {x|x ∈ Ax ∉ B}‖parallel« CC BY-NC-ND 3.0.−→AB| −→Revised: 18 Nov 2012P Q limiting parallel ray

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