Sufficient conditions are obtained for the global existence of a positive periodic solution of periodic neutral delay predator-prey system by using the methodofcoincidence degree theory.
利用重合度理论建立了一类周期中立型时滞捕食者-食饵系统正周期解的全局存在性的充分条件。
2
They argue that this may not be mere coincidence, asserting a belief that PMS is used as a methodof social control.
他们认为这可能不单是个巧合，他们还相信经前综合症被当作一种社会控制方法。
3
The method is: print the word, repeat print 10 times, with a magnification of 40 times to see, if coincidence, equipment qualified.