منابع مشابه
Bounding singular surfaces of general type
We provide simpler proofs of several boundedness theorems, contained in in articles [2], [3], for log surfaces of general type with semi log canonical singularities. At the same time, we make these proofs e ective, with explicit upper bounds.
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چکیده ندارد.
Plane Sextics with a Type E8 Singular Point
We construct explicit geometric models for and compute the fundamental groups of all plane sextics with simple singularities only and with at least one type E8 singular point. In particular, we discover four new sextics with nonabelian fundamental groups; two of them are irreducible. The groups of the two irreducible sextics found are finite. The principal tool used is the reduction to trigonal...
متن کاملPlane Sextics with a Type E6 Singular Point
We give a classification up to equisingular deformation and compute the fundamental groups of maximizing plane sextics with a type E6 singular point.
متن کاملGeneral constraint preconditioning iteration method for singular saddle-point problems
For the singular saddle-point problems with nonsymmetric positive definite (1, 1) block, we present a general constraint preconditioning (GCP) iteration method based on a singular constraint preconditioner. Using the properties of the Moore-Penrose inverse, the convergence properties of the GCP iteration method are studied. In particular, for each of the two different choices of the (1, 1) bloc...
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ژورنال
عنوان ژورنال: Proceedings of the National Academy of Sciences
سال: 1924
ISSN: 0027-8424,1091-6490
DOI: 10.1073/pnas.10.12.488