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READ THESE ARTICLES# Definition of *equation of the first (or second etc.) order* in English:

## equation of the first (or second etc.) order

### phrase

MathematicsAn equation involving only the first derivative, second derivative, etc.

*‘His doctoral dissertation was on the theory of the propeller which led to his developing a theory of partial differential equations of the second order.’**‘This integral was introduced in a paper on differential equations of the second order which he wrote in 1870.’**‘Special attention should be drawn also to his little known pamphlet on regular point of linear differential equations of the second order used for a number of years in connection with one of his courses of lectures.’**‘He did this by using an indeterminate equation of the second order, Nx 2 + 1 = y 2, where N is the number whose square root is to be calculated.’**‘He began mathematical research while still an undergraduate and his first paper, On the isoclinal lines of a differential equation of the first order was published in the Proceedings of The Royal Society of Edinburgh in 1903.’*

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