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arXiv math-ph/0310047math-phmath.MP
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实直线分形子集的微积分-- I:公式化

Calculus on fractal subsets of real line - I: formulation

Abhay Parvate, A. D. Gangal

摘要:

提出了一种基于实数线分形子集的新微积分。定义了一个$α, 0 < α\leq 1$阶积分,称为$F^α$ -积分,它适用于对维数为$α$的具有分形支集$F$的函数进行积分.进一步定义了一个阶为$α, 0 < α\leq 1$的导数,称为$F^α$ -导数,它使我们能够区分像康托阶梯那样只在分形集上“变化”的函数.与经典的分数阶导数不同,$F^α$ -导数是局部的。$F^α$ -演算保留了普通演算的许多简单性。证明了几个结果,包括微积分基本定理的类似物。积分阶梯函数,这是一个概括的功能,如康托阶梯函数,起着关键作用,在此制定。此外,它产生了一个新的定义的维度,$γ$ -维。$F^α$ -微分方程是包含$F^α$ -导数的方程。它们可以用来模拟次线性动力系统和分形时间过程,因为次线性行为与自然出现的阶梯状函数相关联。作为例子,我们讨论了一个分形时间扩散方程,以及在分形介质中受摩擦的粒子的一维运动。

英文摘要:

A new calculus based on fractal subsets of the real line is formulated. In this calculus, an integral of order $α, 0 < α\leq 1$, called $F^α$-integral, is defined, which is suitable to integrate functions with fractal support $F$ of dimension $α$. Further, a derivative of order $α, 0 < α\leq 1$, called $F^α$-derivative, is defined, which enables us to differentiate functions, like the Cantor staircase, ``changing'' only on a fractal set. The $F^α$-derivative is local unlike the classical fractional derivative. The $F^α$-calculus retains much of the simplicity of ordinary calculus. Several results including analogues of fundamental theorems of calculus are proved. The integral staircase function, which is a generalisation of the functions like the Cantor staircase function, plays a key role in this formulation. Further, it gives rise to a new definition of dimension, the $γ$-dimension. $F^α$-differential equations are equations involving $F^α$-derivatives. They can be used to model sublinear dynamical systems and fractal time processes, since sublinear behaviours are associated with staircase-like functions which occur naturally as their solutions. As examples, we discuss a fractal-time diffusion equation, and one dimensional motion of a particle undergoing friction in a fractal medium.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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