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Mathematics
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positive negative
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positive and negative particles curve in opposite directions
закручиваться в противоположных направлениях
the first Betti number is a topological obstruction to the existence of metrics with positive or negative Ricci curvature
препятствие топологической природы к существованию
the inertia of a symmetric matrix is the triple whose elements are the number of
positive, negative
, and zero eigenvalues, counted with multiplicities
инерция матрицы
the number zero is neither positive nor negative
число ноль не является ни положительным, ни отрицательным
...
(i.e., it is both nonpositive and nonnegative)
the signature of a symmetric matrix is the difference between the number of positive eigenvalues and the number of negative eigenvalues
сигнатура матрицы
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