Harvey-Wiman hypermaps
نویسندگان
چکیده
منابع مشابه
Partial Duality of Hypermaps
We introduce a collection of new operations on hypermaps, partial duality, which include the classical Euler-Poincaré dualities as particular cases. These operations generalize the partial duality for maps, or ribbon graphs, recently discovered in a connection with knot theory. Partial duality is different from previous studied operations of S. Wilson, G. Jones, L. James, and A. Vince. Combinat...
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If H is a hypermap with bit set B, a voltage assignment on H is simply a map z : B → Z, where Z is a group. If Z acts on a set X, and if z is a voltage assignment on H, then one constructs a “ramified covering” Hz(X) → H such that in the category of ramified coverings of H, Hz(X) and Hz′(X) are isomorphic whenever z and z′ are equivalent voltages (but not conversely). A lifting criterion is giv...
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Change detection is the study of detecting changes between two different images of a scene taken at different times. This paper proposes the concept of semantic change detection, which involves intuitively inserting semantic meaning into detected change areas. The problem to be solved consists of two parts, semantic segmentation and change detection. In order to solve this problem and obtain a ...
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Ttiic greater the man the greater are his potentialities for good or for evil, and in many instances for both good and evil. The influence of many great men lias been during their lifttime almost entirely good, yet much harm has been done in their names through the unreasoning hero-worship of posterity. For fifteen hundred years, commencing from the second century of the Christian era, the teac...
متن کاملWilliam Harvey
j This is one of the 11 Masters of Medicine" series, the introductory volume of which we reviewed in March. Everything as been done to make the record of the life of this truly great ^>an as complete as possible ; and although the material at the author's disposal was somewhat scanty, yet we have a consecutive and very readable biography supplemented by wellhosen extracts from Harvey's works. T...
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ژورنال
عنوان ژورنال: Discrete Mathematics
سال: 1996
ISSN: 0012-365X
DOI: 10.1016/s0012-365x(96)83005-6