| 1. | This is called a normal system of differential equations .
这称为正规微分方程组。
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| 2. | Newton's second law can be expressed as a differential equation .
牛顿第二定律可表达成微分方程。
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| 3. | To some extent, his work pays dividends in differential equations .
他的工作在某种程度上给微分方程带来了好处。
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| 4. | In 1728 euler gave differential equations for geodesics on surfaces .
1728年，奥伊勒绘出了曲面上测地线的微方程。
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| 5. | Solutions in this sense exist only for very few types of differential equations .
只有很少几类方程才存在这种意义下的解。
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| 6. | The theory of the solution of partial differential equations remained to be fashioned .
偏微分方程解的理论还有待于形成。
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| 7. | His work remains mathematically in the realm of ordinary differential equations .
他的工作在数学上就停留在常微分方程的范围。
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| 8. | Very general systems of differential equations can be reduced to the normal form .
形式很普通的微分方程组可以化为正规的形式。
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| 9. | The more recent research on differential equations is concerned with the qualitative theory .
对微分方程更近代的研究是关于定性理论。
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| 10. | His doctoral dissertation on differential equations connected itself with existence theorems .
他论述微分方程的博士论文涉及到存在理论。
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