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## Main Question or Discussion Point

I ran into some formula:

[itex]^{a}_{0}[/itex]∫J[itex]_{o}[/itex](kr) rdr= a/k J[itex]_{1}[/itex](ka)

How can this be true? What property was used?

[itex]^{a}_{0}[/itex]∫J[itex]_{o}[/itex](kr) rdr= a/k J[itex]_{1}[/itex](ka)

How can this be true? What property was used?