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Arithmetic and Algebra - Interactive Mathematics Miscellany and Puzzles, Alexander BogomolnyAlexander Bofomolny。
数学Algebra (S.O.S. Mathematics) - Dept. of Mathematical Sciences, Univ. of Texas at El Paso。
数学全面展示分形理论及其应用,从入门到精通,从科学到艺术。
数学搜集了一些在现实世界的各种领域里,离散和计算几何的应用方法和例子。
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