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Diverse
By an Amazon.com customer
Concepts of Modern MathematicsConcepts of Modern Mathematics by Ian Stewart
Buy new: $9.20 / Used from: $4.84
A different view on maths
Abel's Proof: An Essay on the Sources and Meaning of Mathematical UnsolvabilityAbel's Proof: An Essay on the Sources and Meaning of Mathematical Unsolvability by Peter Pesic
Buy new: $13.22 / Used from: $6.32
Contribution of Abel in the 5 degree polinomial solutions
Introduction to LogicIntroduction to Logic by Alfred Tarski
Buy new: $9.20 / Used from: $7.49
Prime Numbers: A Computational PerspectivePrime Numbers: A Computational Perspective by Richard Crandall
Buy new: $60.14 / Used from: $50.59
Up to date (2001) on factorisation
The Math Instinct: Why You're a Mathematical Genius (Along with Lobsters, Birds, Cats, and Dogs)The Math Instinct: Why You're a Mathematical Genius (Along with Lobsters, Birds, Cats, and Dogs) by Keith Devlin
Buy new: $11.66 / Used from: $0.12
Chases and Escapes: The Mathematics of Pursuit and EvasionChases and Escapes: The Mathematics of Pursuit and Evasion by Paul J. Nahin
Buy new: $18.21 / Used from: $12.99
Book on a rare subject, the chase and escape theory
Theory of EquationsTheory of Equations by James Victor Uspensky
Buy used from: $7.99
Good on polynomials
Schaum's Outlines: Complex Variables (With an Introduction to Conformal Mapping and Its Applications)Schaum's Outlines: Complex Variables (With an Introduction to Conformal Mapping and Its Applications) by Murray Spiegel
Buy used from: $2.39
Good book on complex variables
Struck by Lightning: The Curious World of ProbabilitiesStruck by Lightning: The Curious World of Probabilities by Jeffrey S. Rosenthal
Buy new: $11.80 / Used from: $21.20
Good book
Chances Are: Adventures in ProbabilityChances Are: Adventures in Probability by Michael Kaplan
Buy new: $10.20 / Used from: $3.75
Along Came GalileoAlong Came Galileo by Jeanne Bendick
Buy new: $8.95 / Used from: $5.75
Biography of Galileo
What Is Mathematics? An Elementary Approach to Ideas and MethodsWhat Is Mathematics? An Elementary Approach to Ideas and Methods by Richard Courant
Buy new: $16.47 / Used from: $9.95
TrigonometryTrigonometry by I.M. Gelfand
Buy new: $22.00 / Used from: $18.99
One of the best to start with
The Motion Paradox: The 2,500-Year Old Puzzle Behind All the Mysteries of Time and SpaceThe Motion Paradox: The 2,500-Year Old Puzzle Behind All the Mysteries of Time and Space by Joseph Mazur
Buy new: $16.47 / Used from: $0.86
Cardano, the gambling scholarCardano, the gambling scholar by Oystein Ore
Buy used from: $72.46
Combinatorics of Finite Sets (Dover Books on Mathematics)Combinatorics of Finite Sets (Dover Books on Mathematics) by Ian Anderson
Good book to start with, problems + solutions
Combinatorics: Set Systems, Hypergraphs, Families of Vectors and Combinatorial ProbabilityCombinatorics: Set Systems, Hypergraphs, Families of Vectors and Combinatorial Probability by Bela Bollobas
Buy new: $45.00 / Used from: $33.24
Classic book on subject
Mathematicians Are People, Too: Stories from the Lives of Great MathematiciansMathematicians Are People, Too: Stories from the Lives of Great Mathematicians by Luetta Reimer
Buy new: $11.65 / Used from: $4.55
Great children's book
Godel's Theorem: An Incomplete Guide to Its Use and AbuseGodel's Theorem: An Incomplete Guide to Its Use and Abuse by Torkel Franzen
Buy new: $26.95 / Used from: $21.00
Axiomatic Set TheoryAxiomatic Set Theory by Patrick Suppes
Buy new: $9.20 / Used from: $5.75
Great to start with, no proofs.
The Psychology of Invention in the Mathematical FieldThe Psychology of Invention in the Mathematical Field by Jacques Hadamard
Buy used from: $6.99