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However I notice many authors still treat it as a fraction- a small change in y over a small change in x. eg

v=L[itex]\frac{di}{dt}[/itex]

di=[itex]\frac{1}{L}[/itex]v dt

[itex]\int[/itex]di=[itex]\frac{1}{L}[/itex][itex]\int[/itex]v(t) dt

Everything works out nicely but it is a bit confusing when operators can be treated as fractions.