Introduction to Combinatorial Analysis
John Riordan
Introduction to Combinatorial Analysis - A book resource
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More resources on Permutations
Brilliant.org - Permutations
Free trial interactive problems (Reddit fave for practice)
Khan Academy - Permutations
Interactive free lessons on permutations
Art of Problem Solving - Combinatorics
Free wiki with permutations problems and solutions
Mathematics for Computer Science
Master permutations with this MIT course on mathematics for computer science by Leighton & van Dijk! Learn key concepts & problem-solving skills.
mathworld.wolfram.com
MathWorld is a comprehensive online math encyclopedia from Wolfram Research offering rigorous, concise articles on mathematical concepts, theorems, definitions, and formulas. It covers topics across algebra, geometry, calculus, combinatorics (including permutations), number theory, and more, with detailed explanations and examples.
Concrete Mathematics
Concrete Mathematics - A book resource