3 papers
math.NT2025
On pairs of triangular numbers whose product is a perfect square and pairs of intervals of successive integers with equal sums of squares
Vladimir Gurvich, Mariya Naumova
A number is a triangular number if it can be written as for some nonnegative integer number . A triangular number is called square if it is a perfect sq…
stat.ME2025
Critical issues with the Pearson's chi-square test
Vladimir Gurvich, Mariya Naumova
Pearson's chi-square tests are among the most commonly applied statistical tools across a wide range of scientific disciplines, including medicine, engineering, biology, sociology,…
math.CO2023
On remoteness functions of k-NIM with k+1 piles in normal and in misère versions
Vladimir Gurvich, Vladislav Maximchuk, Georgy Miheenkov +1
Given integer and such that and piles of stones, two players alternate turns. By one move it is allowed to choose any piles and remove exactly one st…