弯曲的人
发表于 2025-3-26 23:23:19
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mercenary
发表于 2025-3-27 03:46:42
Trees and forests,r free, trees. It is shown how to build up trees from the tree with a single vertex, using the beta-product and the B+ operation, together with a prefix (Polish) operator. Formal linear combinations of forests are introduced as the “forest space” and, as an application, the enumeration of trees is s
LIMIT
发表于 2025-3-27 07:08:39
B-series and Algebraic Analysis,ings. One mapping would be the exact flow through a specified time step and the other would be a numerical scheme, such as a Runge–Kutta method. The B-series approach to questions like this is to write the Taylor expansions of the two mappings in a special way, in terms of “elementary differentials”
植物茂盛
发表于 2025-3-27 11:40:15
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reaching
发表于 2025-3-27 14:55:12
,B-series and Runge–Kutta methods,ting there is no interest in numerical methods which are applicable only to scalar problems and, above order 4, an analysis based on B-series is more appropriate. Even for order 5 there exist scalar methods with reduced order when applied to non-scalar problems. Explicit methods to order 5 are deriv
Permanent
发表于 2025-3-27 20:24:31
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阉割
发表于 2025-3-27 23:45:40
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Chemotherapy
发表于 2025-3-28 03:33:39
10楼
adj忧郁的
发表于 2025-3-28 07:30:58
10楼
CAJ
发表于 2025-3-28 13:16:29
10楼