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Question: How does one use these equations containing differentials?

Question:How does one use these equations containing differentials?

Earl 955 Maple 2020
plotting topographical-lines
January 02 2021
2

This website suggests that the viewer write equations containing differentials and use them to plot topographical lines.

https://mathcurve.com/courbes3d.gb/topographic/topographic.shtml

I am basically familiar with equations containing derivatives, but not with equations containing differentials.

How can one employ these to draw the lines shown in the website's various plots of surfaces?
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