Coincidence

Gamma-gamma Coincidence Overlap Coincidence Method for Measuring Gamma-gamma Coincidence of Na Radiation Safety

RADIATION SAFETY The radioactive sources used in this experiment are only a few microcuries in strength, and they are all sealed, so they actually pose no significant health hazard. However we will follow good safety procedure. Horseplay involving the sources is forbidden. While the sources are not dangerous, like any radioactive source they should be treated with respect and properly handled. ...

Overlap coincidence to strong coincidence in substitution tiling dynamics

Overlap coincidence is an equivalent criterion to pure discrete spectrum of the dynamics of self-affine tilings in R. In the case of d = 1, strong coincidence on m-letter irreducible substitution has been introduced in [10, 8] which implies that the system is metrically conjugate to a domain exchange in Rm−1. However being a domain exchange does not imply the property of pure discrete spectrum ...

Multiple sudden infant deaths -- coincidence or beyond coincidence?

The relative coincidence

We define a relative coincidence Nielsen number Nrel(f, g) for pairs of maps between manifolds, prove a Wecken type theorem for this invariant and give some formulae expressing Nrel(f, g) by the ordinary Nielsen numbers. Introduction. In [S2] pairs of spaces A ⊂ X and maps f : X → X such that f(A) ⊂ A were considered. A relative Nielsen number of such maps was defined, i.e. a lower bound of the...

Linking and Coincidence Invariants

Given a link map f into a manifold of the form Q = N ×R, when can it be deformed to an “unlinked” position (in some sense, e.g. where its components map to disjoint R-levels)? Using the language of normal bordism theory as well as the path space approach of Hatcher and Quinn we define obstructions ω̃ε(f), ε = + or ε = −, which often answer this question completely and which, in addition, turn ou...