منابع مشابه
Equal Area World Maps: A Case Study
If one wishes to produce a world map that displays area-based data, such as the extent of rain forests, the range of butterfly migrations, or the access of people in various regions to medical facilities, then it is often appropriate to use a base map that shows the areas of all regions of the earth’s surface in their correct proportions. Such a map is called an equal area or equivalent map by ...
متن کاملA Note on Spectrum Preserving Additive Maps on C*-Algebras
Mathieu and Ruddy proved that if be a unital spectral isometry from a unital C*-algebra Aonto a unital type I C*-algebra B whose primitive ideal space is Hausdorff and totallydisconnected, then is Jordan isomorphism. The aim of this note is to show that if be asurjective spectrum preserving additive map, then is a Jordan isomorphism without the extraassumption totally disconnected.
متن کاملA Note on Quadratic Maps for Hilbert Space Operators
In this paper, we introduce the notion of sesquilinear map on Β(H) . Based on this notion, we define the quadratic map, which is the generalization of positive linear map. With the help of this concept, we prove several well-known equality and inequality...
متن کاملA Note on Open Maps
In [l ] E. E. Floyd proved that if X and Y are Peano continua and f: X—>F is light, open, and onto, then the covering homotopy property for a point holds. Here we will prove (Theorem 1) that under different (roughly speaking, more general) conditions the covering homotopy property for a point holds up to a homotopy. This has certain implications on the induced homomorphism of the fundamental gr...
متن کاملRational Triangles with Equal Area
We consider the set of triangles in the plane with rational sides and a given area A. We show there are infinitely many such triangles for each possible area A. We also show that infinitely many such triangles may be constructed from a given one, all sharing a side of the original triangle, unless the original is equilateral. There are three families of triangles (including the isosceles ones) ...
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ژورنال
عنوان ژورنال: Monthly Notices of the Royal Astronomical Society
سال: 1920
ISSN: 0035-8711,1365-2966
DOI: 10.1093/mnras/80.9.791