Uncertain factors of foundation subsidence were put forward. Direct probability method and random finite element method for foundation subsidence analysis were presented.
提出了地基沉降分析中的不确定因素，简述了地基沉降的直接概率分析法、随机有限元法。
This paper USES the set theory, derivation principles and probability method to give a direct and simple solution to several important combinatorial identities.
组合恒等式在组合数学中占有重要的地位，它有多种证法，运用集合论的观点，求导法则和概率方法对几个重要的组合等式给出了直观简洁的证明。
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