Synchrotron function

In mathematics the synchrotron functions are defined as follows (for x ≥ 0):

• First synchrotron function

$f(x)=x\int _{x}^{\infty }K_{\frac {5}{3}}(t)\,dt$

where K_5/3 is [what function?? Please fill in this blank.].

• Second synchrotron function

$f(x)=xK_{\frac {2}{3}}(x)$

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