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Beauville Surfaces and Groups by Ingrid Bauer, Shelly Garion, Alina Vdovina

By Ingrid Bauer, Shelly Garion, Alina Vdovina

This number of surveys and study articles explores a desirable type of types: Beauville surfaces. it's the first time that those items are mentioned from the issues of view of algebraic geometry in addition to workforce concept. The publication additionally comprises a number of open difficulties and conjectures regarding those surfaces.

Beauville surfaces are a category of inflexible usual surfaces of normal variety, that are defined in a in basic terms algebraic combinatoric means. They play an incredible position in several fields of arithmetic like algebraic geometry, staff idea and quantity conception. The idea of Beauville floor used to be brought by way of Fabrizio Catanese in 2000 and after the 1st systematic examine of those surfaces by way of Ingrid Bauer, Fabrizio Catanese and Fritz Grunewald, there was an expanding curiosity within the subject.

These court cases replicate the subjects of the lectures provided through the workshop ‘Beauville surfaces and teams 2012’, held at Newcastle college, united kingdom in June 2012. This convention introduced jointly, for the 1st time, specialists of other fields of arithmetic attracted to Beauville surfaces.

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Beauville Surfaces and Groups

This number of surveys and examine articles explores a desirable category of sorts: Beauville surfaces. it's the first time that those gadgets are mentioned from the issues of view of algebraic geometry in addition to crew thought. The publication additionally comprises numerous open difficulties and conjectures on the topic of those surfaces.

Extra resources for Beauville Surfaces and Groups

Example text

The generators of TK , where K × is a triangle presentation from [8, 9], are the au = u −1 (1 + σ)u, where u ∈ F× 27 /F3 . × × 13 12 −k k Since F27 = F3 · {1 = θ , θ, . . , θ }, we choose αk = θ (1 + σ)θ as in [9, p. 178]. The αk ’s act on A by conjugation. A straightforward calculation yields 1 1 j + θ3i+2k − θi+2·3 k σ j+1 Y Y 1 Y −1 j j+1 j+1 . + θi+8·3 k − θ3i+2k+2·3 k σ j+2 + θ3i+2k+8·3 k σ j Y Y αk θi σ j αk−1 = θi σ j Expressing the conjugation by αk with respect to the above basis of A then gives rise to a representation as a 9 × 9 matrix over the field F3 (1/Y ).

Given a finite field K = Fq (for q a prime power), a positive presentation with star graph isomorphic to this incidence graph of the Desarguesian projective plane over K is formed. The construction takes a cubic extension of K , namely F = Fq 3 , and identifies the cyclic group Cm = F × /K × with the points of the projective pane P over K , where m = q 2 + q + 1. e. Cm is a Singer group, see [16]. e. a set of residues a1 , . . , aq+1 mod m such that every non-zero residue modulo m = q 2 + q + 1 can be expressed uniquely in the form ai − a j .

Fairbairn For the second triple we consider the matrices ⎛ 0 ⎜0 x2 := ⎜ ⎝0 1 0 0 1 0 0 1 0 δ4 ⎞ 1 0⎟ ⎟ δ4 ⎠ δ2 ⎛ 2 4 0 ⎜ 4 0 1 y2 := ⎜ ⎝0 1 0 1 0 0 ⎞ 1 0⎟ ⎟ 0⎠ 0 where δ, ∈ Fq are chosen so that δ = and these do not have the correct form for these elements to have order q − 1. Direct calculation shows that these elements do not have orders 2 or 4√and that o(x2 y2 ) = 2. These elements must, therefore, have orders that divide q ± 2q + 1. Furthermore their traces are 2 and δ 2 which can be chosen to be in no proper subfield since x → x 2 is an automorphism of the field Fq .

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