ratio of the adjacent to the opposite side of a right-angled triangle 同义词：cotan,
例句与用法
1.
The moment map of this twisted cotangent sun ( t ) bundle is matched to the d - equation with fayet - illiopoulos source term , so the dynamics of the noncommutative solitons becomes that of the brane 我们由此扭曲的su _ n ( t )余切丛的momentmap给出了有fayt - illiopoulos源的d -方程，由此非对易孤立子的动力学就变成brane的动力学。
2.
Furthermore , in the noncommutative chern - simons theory for the quantum hall effect , the constrain equation with quasiparticle source is also identified with the moment map eqaution of the noncommutative sun ( t ) cotangent bundle with marked points 而且，在量子hall效应的非对易陈- simons理论里，具有准粒子源的约束方程也与具有marked点的非对易su _ n ( t )余切丛的momentmap方程相同。
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