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The skeleton of a rhombicuboctahedron can be described as a polyhedral graph, meaning a graph that is planar and 3-vertex-connected. In other words, the edges of a graph are not crossed while being drawn, and removing any two of its vertices leaves a connected subgraph. The rhombicuboctahedral graph has 24 vertices and 48 edges.
Stable Z/N chart of La and Ba. Naturally occurring lanthanum (57 La) is composed of one stable (139 La) and one radioactive (138 La) isotope, with the stable isotope, 139 La, being the most abundant (99.91% natural abundance).
Pell's equation, also called the Pell–Fermat equation, is any Diophantine equation of the form =, where n is a given positive nonsquare integer, and integer solutions are sought for x and y. In Cartesian coordinates , the equation is represented by a hyperbola ; solutions occur wherever the curve passes through a point whose x and y ...
For overlapping or touching squares, (site) given here is the net fraction of sites occupied similar to the in continuum percolation. The case of a 2×2 square is equivalent to percolation of a square lattice NN+2NN+3NN+4NN or sq-1,2,3,4 with threshold 1 − ( 1 − ϕ c ) 1 / 4 = 0.196724 ( 10 ) … {\displaystyle 1-(1-\phi _{c})^{1/4}=0. ...
Yellow: radiation between 3.8 and 19 microsieverts per hour. This corresponds to less than a chest X-ray to 3 chest X-rays. This is the threshold to designate an area an evacuation zone. The yellow area extended far beyond the evacuation zone already put into place. Light green: radiation between 0.5 and one microsieverts per hour.
The Baire category theorem (BCT) is an important result in general topology and functional analysis.The theorem has two forms, each of which gives sufficient conditions for a topological space to be a Baire space (a topological space such that the intersection of countably many dense open sets is still dense).
A certain category of small-world networks were identified as a class of random graphs by Duncan Watts and Steven Strogatz in 1998. [4] They noted that graphs could be classified according to two independent structural features, namely the clustering coefficient, and average node-to-node distance (also known as average shortest path length).
Boyce–Codd normal form, a normal form used in database normalization. The definition of what we now know as BCNF appeared in a paper by Ian Heath in 1971. [11] Date writes: Since that definition predated Boyce and Codd's own definition by some three years, it seems to me that BCNF ought by rights to be called Heath normal form. But it isn't.