by Geoffrey Grimmett
Ten goats are to be assigned to three brothers in numbers proportional to the ages (in years) of the recipients. Given the integral nature of a goat, it is not generally possible to meet exactly the condition of proportionality, and the resulting “apportionment problem” is a classic of operational research. The most studied and contentious instance of the problem is the allocation to states of the 435 seats in the U.S. House of Representatives. We propose an apparently new method of apportionment that is stochastic, that meets the so-called quota condition, and that is fair in the sense of mean values. Two sources of systematic unfairness are identified, firstly the lower bound condition (every state shall receive at least one seat), and secondly the lower quota condition (every state shall receive at least the integral part of its quota).
Evaluation of Ill-Behaved Power Series
by Pirooz Mohazzabi and Thomas A. Fournelle
Ill-behaved power series of mathematical physics that pose insurmountable computational difficulties and require unreasonable high precisions and computing resources may be transformed into linear differential equations that can be solved numerically in a straightforward fashion. Several examples are discussed.
Fermat’s Last Theorem for Rational Exponents
by Curtis D. Bennett, A.M.W. Glass, and Gábor J. Szekely
firstname.lastname@example.org, A.M.W.Glass@dpmms.cam.ac.uk, email@example.com
Fermat’s Last Theorem states that an + bn = cn has no positive integer solutions for n > 2. How does allowing for rational exponents with numerator greater than 2 and complex roots change the conclusion? Surprisingly, classical triangles and the laws of sines and cosines become embroiled in the proof that the only new solutions arise from taking sixth roots of unity and a, b, and c of equal modulus.
Two Exams Taken by Ramanujan in India
by Bruce C. Berndt and C. A. Reddi
According to Ramanujan’s biographers, he took only three exams outside of primary and secondary schools. First, Ramanujan sat for the Matriculation Exam to enter the Government College of Kumbakonam. Second, he took an exam at the end of his first and only year at the Government College. Third, he took the First Arts Examination of the University of Madras in an attempt to obtain a degree by examination. Searching in the Tamil Nadu Archives, the second author found copies of the first and third exams. We reproduce these exams in our article and offer extensive comments on Ramanujan’s performances.
The Wave Equation, Mixed Partial Derivatives, and Fubini’s Theorem
by Asuman Aksoy and Mario Martelli
One Observation behind Two-Envelope Puzzles
by Dov Samet, Iddo Samet, and David Schmeidler
firstname.lastname@example.org, email@example.com, firstname.lastname@example.org
On the “Reducibility” of Arctangents of Integers
by E. Kowalski
Kepler’s First Law—A Remark
by Paul Monsky
An Elementary Proof of Krull’s Intersection Theorem
by Hervé Perdry
Lattices in C and Finite Subsets of a Circle
by Jacob Mostovoy
Problems and Solutions
Advanced Modern Algebra
by Joseph J. Rotman
Reviewed by Daniel R. Farkas
Practical Analysis in One Variable
by Donald Estep
Reviewed by Paul Zorn