白杨
发表于 2025-3-28 14:50:11
,Über die Existenz Positiver Periodischer Lösungen bei einem Allgemeinen Diffusionsmodell,This paper is concerned with a general diffusion model which is described by a system of linear differential equations. Under certain conditions the existence of positiv periodic solutions is shown, if the coefficients and the right-hand side of the system are periodic.
Musculoskeletal
发表于 2025-3-28 22:49:41
,Anwachsende Schwingungen bei einigen Differenzengleichungen mit multiplikativem Verzögerungsglied,ons is very different in the cases 0<α<1/2 and 1/2≤α<1. In the second case exists as solution y. for all n only y.=0, but there exist unboundedly increasing solutions for sufficiently large n. Numbers and graphs are given for some special values of a and the equation (above)is compared with the differential equation y′(x)=−cy(αx).
不可知论
发表于 2025-3-29 00:38:21
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glucagon
发表于 2025-3-29 05:06:47
Improved Absolute Stability of Predictor-Corrector Methods for Retarded Differential Equations,form dy(t)/dt = ω.y(t) + ω.y(t−ω) where ω., ω. and ω are constants (ω>0). By generalizing the conventional predictor-corrector methods it is possible to improve the stability region in the (ω.Δt, ω.Δt) — plane considerably. In particular, methods based on extrapolation-predictors and backward differentiation- correctors are studied.
雪白
发表于 2025-3-29 07:14:32
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B-cell
发表于 2025-3-29 13:51:57
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占卜者
发表于 2025-3-29 16:48:28
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凝视
发表于 2025-3-29 23:04:59
978-3-0348-6769-6Springer Basel AG 1983
Obvious
发表于 2025-3-30 00:33:23
https://doi.org/10.1007/978-90-481-9612-8se operators are of “monotonie type”, that is isotonic if Lu≤lv implies u≤v and antitonic if Lu≤lv implies u≥v, are given. It is considered the case of a variable delay τ=τ(t) and, separately, that of a constant delay τ. The first one is more general, as well as the conditions which are found. On th
相互影响
发表于 2025-3-30 07:24:18
A Procedural View of Critical Reasonablenessween Z. and Z. allows for diffusive and/or convective transport. We have shown that branches of stable steady states are possible involving alterations of substrate concentration in Z. and Z. only whereas Z.,…,Z. operate on a nearly constant concentration level along the branch. There are symmetric