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Extended Affine Lie Superalgebras [PDF]

open access: yesarXiv, 2013
We introduce the notion of extended affine Lie superalgebras and investigate the properties of their root systems. Extended affine Lie algebras, invariant affine reflection algebras, finite dimensional basic classical simple Lie superalgebras and affine Lie superalgebras are examples of extended affine Lie superalgebras.
arxiv  

On the Affinities of Hesperornis [PDF]

open access: yesNature, 1890
AMONG some very useful and important papers recently issued by the Museum of Zoology of the University College, Dundee, appears one by Prof. D'Arcy Thompson, “On the Systematic Position of Hesperornis.” In this excellent scientific brochure, Prof. Thompson has critically compared in detail the skeleton of a diver (Colymbus septentrionalis) with the ...
openaire   +2 more sources

Self-affine quadrangles [PDF]

open access: yesarXiv
A quadrangle in the Euclidean plane is called $n$-self-affine if it has a dissection into $n$ affine images of itself. All convex quadrangles are known to be $n$-self-affine for every $n \ge 5$. The only $2$-self-affine convex quadrangles are trapezoids.
arxiv  

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