High Quality Content by WIKIPEDIA articles! In vector calculus, a Laplacian vector field is a vector field which is both irrotational and incompressible. In mathematics, the Cauchy–Riemann differential equations in complex analysis, named after Augustin Cauchy and Bernhard Riemann, consist of a system of two partial differential equations that provides a necessary and sufficient condition for a differentiable function to be holomorphic in an open set. This system of equations first appeared in...
High Quality Content by WIKIPEDIA articles! In vector calculus, a Laplacian vector field is a vector field which is both irrotational and incompressible. In mathematics, the Cauchy–Riemann differential equations in complex analysis, named after Augustin Cauchy and Bernhard Riemann, consist of a system of two partial differential equations that provides a necessary and sufficient condition for a differentiable function to be holomorphic in an open set. This system of equations first appeared in the work of Jean le Rond d'Alembert (d'Alembert 1752). Later, Leonhard Euler connected this system to the analytic functions (Euler 1777). Cauchy (1814) then used these equations to construct his theory of functions. Riemann's dissertation (Riemann 1851) on the theory of functions appeared in 1851. The equations are one way of looking at the condition on a function to be differentiable (holomorphic) in the sense of complex analysis: in other words they encapsulate the notion of function of a complex variable by means of conventional differential calculus.
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"Если ты уйдешь, я умру!" "Как можно быть таким эгоистом?" "После того, что я сделал для тебя…" Все это знакомые до боли большинству из нас формулировки эмоционального шантажа – мощного способа манипуляции, к которому нередко прибегают близкие нам люди. Сюзен Форвард, автор семи мировых бестселлеров по психологии, с присущей ей проницательностью анализирует природу этого явления. А потом...
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