By applying a fixed point theorem, the authors study the existence of positive periodic solutions to a class of differential equations with stated-dependent delay.

运用不动点定理，研究一类具状态依赖时滞的微分方程周期正解的存在性。

youdao

By using a well-known fixed point index theorem, we obtain the existence, multiplicity and nonexistence of positive periodic solution(s) to this equation.

利用一个著名的不动点指标定理，获得了该方程周期正解的存在性、多重性和不存在性。

youdao

A fixed point theorem in cone is used to study the existence of normal solution of second-order periodic boundary value problems.

利用锥不动点定理研究了一类二阶非线性周期边值问题正解的存在性。

youdao

Donuts plans to augment that with a 14-point security system including periodic audits, taking down websites when merited, and a central listing of protected names so Donuts can prevent them from being registered on any of the generic domains it controls, Mason said.

FORBES: Cybersquatters Get Rich New Territories With Generic Domains

As a point of reference, there is something called the Callahan Periodic Table that lays out which asset classes were the best and worst for each year going back to 1992.

FORBES: Make The Most Out Of Your 401(k) Contributions Right Now

Thus, leaving aside natural disasters, such as the periodic droughts that sweep Brazil's north-east, a huge programme of food aid might be missing the point.

ECONOMIST: Three square meals a day