Solomon ( 1975 ) introduced the concept of random walk in a random environment , proved the existence of the model on the set of integers , and obtained its limit theorems Solomon ( 1975 )引进了随机环境中随机游动的概念,在整数集上证明了该模型的存在性,并得到了它的极限定理。
By choosing the tune scale to be the set of real numbers , it yields a differential equation , and by choosing the time scale to be the set of integers , it yields a difference equation 如果选择时间模是实数集r ,它就是通常的微分方程;如果选择时间模是整数集z ,那么它就是差分方程了。
整数: integer; whole number; integ ...集: gather; assemble; collect非负整数集: set of nonnegative integer有序整数集: ordered set of integer正整数集: the set of all positive integers数集: number set; set of numbers整数: 1.(不含分数或小数的数) integer; whole number; integral number2.(没有零头的数目) round number; round figure代数集: algebraic set复数集: set of complex numbers函数集: function set可数集: countable aggregate; countable set; denumerable aggregate; denumerable set; enumerable set偶数集: the set of all even numbers奇数集: the set of all odd numbers实数集: real number整数;完整数: whole number不可数集: non countable set; non denumerable set; non enumerable set; uncountable aggregate; uncountable set不可数集合: uncountable set常规参数集: general代数集合: algebraic set代数集刊: algebra colloquium代数集刊(英): algebr colloq第一导数集: first derivative set递归可数集: recursively countable set; recursively enumerable set仿射代数集: affine algebraic set; algebraic affine variety可计数集: countable set