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Explorations in Number Theory [McLeman] - mklabgr - 09-03-2026
Explorations in Number Theory: Commuting through the Numberverse
Authors: Cam McLeman, Erin McNicholas, Colin Starr
Publication date: 18 December 2022 (eBook)
Publisher: Springer Cham
Series:Undergraduate Texts in Mathematics
Edition: 1st edition
Pages: XIII + 372
Main areas: Number Theory, Abstract Algebra
Explorations in Number Theory is an undergraduate textbook that presents elementary number theory through the viewpoint of abstract algebra. Rather than treating integers in isolation, the authors repeatedly ask what a “number” actually is and explore arithmetic in several different number systems. Classical ideas such as divisibility, primes, congruences and Diophantine equations gradually lead to groups, rings and fields. A recurring theme is the Fundamental Theorem of Arithmetic—why unique prime factorization works in $\mathbb Z$, what happens when it fails in other rings, and how algebraic structures help explain these phenomena.
The progression moves from ordinary integers and modular arithmetic to Gaussian integers $\mathbb Z[i]$, complex and quadratic number systems, cyclotomic ideas and finally $p$-adic numbers. Along the way the book introduces connections with elliptic curves, polynomial arithmetic, quadratic reciprocity and algebraic number theory. Diophantine equations act as a bridge between computational problems and deeper structural mathematics. The book is deliberately exploratory: inquiry-based-learning sections encourage students to discover patterns before formal results are introduced, while exercises are divided into calculations, informal and formal proofs, computational experiments, and broader number-theory questions. Python worksheets are also provided for readers without extensive programming experience.
The final part broadens the material through projects on public-key cryptography, Lagrange's four-square theorem, Pell equations, cases related to Fermat's Last Theorem, and deeper algebraic number theory. Consequently, the book works especially well as a transition from a first course in elementary number theory toward abstract or algebraic number theory. The expected background is relatively modest—complex numbers, matrices, vector spaces and familiarity with mathematical proofs—but the approach is more conceptual than that of a standard introductory number-theory textbook.
Key takeaways
- Number theory + abstract algebra: the central feature is explaining arithmetic using rings, groups and fields rather than treating them as separate subjects.
- Multiple number systems: students move from $\mathbb Z$ and $\mathbb Z/n\mathbb Z$ to Gaussian integers, cyclotomic structures and $p$-adic arithmetic.
- Discovery-oriented: inquiry-based explorations, computational experimentation and Python exercises make the book particularly suitable for active learning.
- Best audience: strong undergraduates who already know basic proof techniques and want a bridge from elementary number theory to algebraic number theory.
BOOK