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The spatial distribution and seasonal variation in the concentrations in Lake Biwa of pesticides used in paddy fields were studied. Lake Biwa is the largest lake in Japan and is a recognized water… (More)
The adjoint linear system on a surface have been studied by many authors. Among these, Reider's criterion on a smooth surface is very famous. Here we prove a similar criterion on normal surfaces.
We prove effective base point freeness of the adjoint linear system on normal surfaces with a boundary. Let Y be a compact normal two dimentional projective variety over C (we call it " normal… (More)