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The fundamental laws necessary for the mathematical treatment of a large part of physics and the whole of chemistry are thus completely known, and the difficulty lies only in the fact that application of these laws leads to equations that are too complex to be solved.

因此，对物理学的大部分和整个化学进行数学处理所必需的基本定律是完全知道的，而困难之处在于，应用这些定律会导致方程过于复杂而无法求解。

— Paul Dirac 狄拉克