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## Main Question or Discussion Point

If I have:

[tex]\frac{dA(t,z)}{dz}[/tex]

is it possible to convert this to a differential in the form:

[tex]\frac{dI(t,z)}{dz}[/tex]

given that [tex]I(t,z)=|A(t,z)|^2/a[/tex]? (Where [tex]a[/tex] is a constant).

Any advice would help, thanks.

[tex]\frac{dA(t,z)}{dz}[/tex]

is it possible to convert this to a differential in the form:

[tex]\frac{dI(t,z)}{dz}[/tex]

given that [tex]I(t,z)=|A(t,z)|^2/a[/tex]? (Where [tex]a[/tex] is a constant).

Any advice would help, thanks.