Axisymmetric elasticity problem of cubic quasicrystal is reduced to a solution of a partial differential equation with higher-order by introducing displacement function.
本文通过引入位移函数使得立方准晶的轴对称弹性问题化为求阶偏微分方程。
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In fact, the problem with relativity wasn't that it involved a lot of differential equations, Lorentz transformations, and other complicated mathematics (though it did-even Einstein needed help with some of it), but that it was just so thoroughly nonintuitive.
实际上,相对论问题并不在于它涉及许多微分方程、洛伦兹变换其他复杂数学(虽然它确实涉及——有方面连爱因斯坦也需要别人帮忙),而是在于它不是凭直觉所能完全搞懂。