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Small Cover is an -dimensional manifold endowed with a Z2 action whose orbit space is a simple convex polytope . It is known that a small cover over is characterized by a coloring of which satisfies… (More)

- Yasuzo Nishimura
- 2015

Let KU and KO be the complex and the real K-spectrum, respectively. For any CW-spectrum X its If [/-homology group KU*X is regarded as a (Z/2-graded) abelian group with involution because KU… (More)

- Yasuzo Nishimura, Y. NlSHIMURA

In this paper, we determine the Nielsen numbers of periodic homotopy idempotents on the n-dimensional torus Tn. In the special case n = 2, we classify the homotopy types of periodic homotopy… (More)

- Yasuzo Nishimura
- 2019

Pick’s theorem relates the number of lattice points to the area for a lattice polygon. Diaz and Robins gave a proof of Pick’s theorem by using the Weierstrass $$\wp $$℘-function and complex analysis.… (More)

- Yasuzo Nishimura
- 1996

Abstract AC and DC magnetic measurements are made on the R 2 Mo 2 O 7 (R=Er– Nd , Y ) pyrochlores. The experimental data indicate that the ordering characteristics are spin-glass-like for R=Er–Tb and… (More)