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21 semigroup
мат.полугруппа, квазигруппа- almost unitary semigroup - completely simple semigroup - finitely convergent semigroup - finitely generated semigroup - finitely presented semigroup - fully reducible semigroup - left cancellative semigroup - left concentric semigroup - left zero semigroup - right cancellative semigroup - right concentric semigroup - right zero semigroup - self-adjoint semigroup - self-conjugate semigroup - semigroup of right translations - strongly continuous semigroup - strongly integrable semigroup - strongly measurable semigroup - strongly reversible semigroup - totally primitive semigroup - totally regular semigroup - totally simple semigroup - weakly reductive semigroup -
22 singularity
1) однородность2) особая точка3) особенность4) отдельность5) своеобразие9) странность•- directly transcendental singularity - singularity of smooth mappingtest for singularity — мат. критерий особенности
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23 sphere
1) поле [сфера] деятельности2) сфера, шар•mapping into a sphere — мат. отображение в сферу
sphere with a handle — мат. сфера с ручкой
sphere with a hole — мат. сфера с отверстием
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