منابع مشابه
Darren Knight
Glaucoma is an ocular disease that leads to the degeneration of retinal ganglion cells. In the chronic version of glaucoma, lack of pain creates patients that are often unaware that they their eyesight has begun to deteriorate. They remain unaware of their condition until they suddenly lose their sight due to leaving the disease untreated. Even when glaucoma is diagnosed, a considerable number ...
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Why is the academy in general, and philosophy in particular, not more involved in the fight against the creationist threat?Andwhy,when a response is offered, is it so curiously ineffective? I argue, by using an analogy with the battle against the Black Knight from the movie Monty Python and the Holy Grail, that the difficulty lies largely in a failure to see the nature of the problem clearly. B...
متن کاملThe Irrational Chess Knight
While in the univariate case solutions of linear recurrences with constant coeecients have rational generating functions, in the multivariate case the situation is much more interesting: even though initial conditions have rational generating functions, the corresponding solutions can have generating functions which are algebraic but not rational, and perhaps even non-algebraic. We start by an ...
متن کاملKnight move in chromatic cohomology
In this paper we prove the knight move theorem for the chromatic graph cohomologies with rational coefficients introduced by L. HelmeGuizon and Y. Rong. Namely, for a connected graph Γ with n vertices the only non-trivial cohomology groups H(Γ), H(Γ) come in isomorphic pairs: H(Γ) = H(Γ) for i > 0 if Γ is non-bipartite, and for i > 0 if Γ is bipartite. As a corollary, the ranks of the cohomolog...
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T itanium dioxide (TiO 2) is a multi-faceted compound. It's the stuff that makes toothpaste white and paint opaque. TiO 2 is also a potent photocatalyst that can break down almost any organic compound, and a number of companies are seeking to capitalize on TiO 2 's reactivity by developing a wide range of environmentally beneficial products. During the late 1970s, scientists began to realize th...
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ژورنال
عنوان ژورنال: BMJ
سال: 2005
ISSN: 0959-8138,1468-5833
DOI: 10.1136/bmj.330.7505.1455-a