In chapter two: we compute the second variation of F- energy functions,which is the base of the full thesis.
第二章：主要计算F-能量泛函的第二变分公式。 它是本文结论的基础。
参考来源 - F·2,447,543篇论文数据，部分数据来源于NoteExpress
In the second variation, called the "vertical archipelago", the village exploits resources in widely dispersed locations, constituting a series of independent production "islands".
第二种变异称为“垂直群岛”，村庄在广泛分散的地点开发资源，构成一系列独立生产的“岛屿”。
In the second variation, writing a row means modifying an existing row.
在第二个变体中，写一行意味着修改一个现有的行。
The second variation, linear or nonlinear, gives the criteria of instability.
无论线性或非线性二阶变分都给出不稳定性判据。
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