This crossword clue is for the definition: Ring-shaped.
it’s A 11 letters crossword puzzle definition.
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Possible Answers: ANNULAR.

Last seen on: LA Times Crossword 27 Jun 19, Thursday

Random information on the term “Ring-shaped”:

In mathematics, an algebraic torus is a type of commutative affine algebraic group. These groups were named by analogy with the theory of tori in Lie group theory (see Cartan subgroup).

Tori are of fundamental importance in the theory of algebraic groups and Lie groups and in the study of the geometric objects associated to them such as symmetric spaces and buildings.

In most places we suppose that the base field is perfect (for example finite or characteristic zero). In general one has to use separable closures instead of algebraic closures.

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If F {\displaystyle F} is a field then the multiplicative group over F {\displaystyle F} is the algebraic group G m {\displaystyle \mathbf {G} _{\mathbf {m} }} such that for any field extension E / F {\displaystyle E/F} the E {\displaystyle E} -points are isomorphic to the group E × {\displaystyle E^{\times }} . To define it properly as an algebraic group one can take the affine variety defined by the equation x y = 1 {\displaystyle xy=1} in the affine plane over F {\displaystyle F} with coordinates x , y {\displaystyle x,y} . The multiplication is then given by restricting the regular rational map F 2 × F 2 → F 2 {\displaystyle F^{2}\times F^{2}\to F^{2}} defined by ( ( x , y ) , ( x ′ , y ′ ) ) ↦ ( x x ′ , y y ′ ) {\displaystyle ((x,y),(x’,y’))\mapsto (xx’,yy’)} and the inverse is the restriction of the regular rational map ( x , y ) ↦ ( y , x ) {\displaystyle (x,y)\mapsto (y,x)} .

Ring-shaped on Wikipedia