42,072 research outputs found
Review of \u3cem\u3eThe Global Luther: A Theologian for Modern Times\u3c/em\u3e
The article reviews the book The Global Luther: A Theologian for Modern Times edited by Christine Helmer
Alvin Helmer of Lidgerwood: Germany, World War II
North Dakota Prisoner of War Report by Alvin Helmer (1920-1999) of Lidgerwood. Helmer was a POW of Germany during the Second World War.
17 page
An Algorithm to Compute the Topological Euler Characteristic, Chern-Schwartz-MacPherson Class and Segre Class of Projective Varieties
Let be a closed subscheme of a projective space . We give
an algorithm to compute the Chern-Schwartz-MacPherson class, Euler
characteristic and Segre class of . The algorithm can be implemented using
either symbolic or numerical methods. The algorithm is based on a new method
for calculating the projective degrees of a rational map defined by a
homogeneous ideal. Using this result and known formulas for the
Chern-Schwartz-MacPherson class of a projective hypersurface and the Segre
class of a projective variety in terms of the projective degrees of certain
rational maps we give algorithms to compute the Chern-Schwartz-MacPherson class
and Segre class of a projective variety. Since the Euler characteristic of
is the degree of the zero dimensional component of the
Chern-Schwartz-MacPherson class of our algorithm also computes the Euler
characteristic . Relationships between the algorithm developed here
and other existing algorithms are discussed. The algorithm is tested on several
examples and performs favourably compared to current algorithms for computing
Chern-Schwartz-MacPherson classes, Segre classes and Euler characteristics
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