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Hope you guys can help me out. I have a mathematical expression which I constructed its: $ A_S = \frac{A_{U_{Max}} - A_{U_{Min}}}{U\sqrt{2}} $

Is there a way in which I could mathematically specify along with this equation that if $A_{U_{Max}}=A_{U_{Min}}=$NULL then $A_S = U$? This would then mean that the variable $A_S$ could basically have two values it could either be equal to $U$ on the condition that $A_{U_{Max}}$=NULL and $A_{U_{Min}}$=NULL or it could be something else depending on the values of $A_{U_{Max}}$ and $A_{U_{Min}}$.

Any suggestions would be appreciated.

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    Like a) in statistics: that data were not e$x$plored/missing data. Here its going to be missing data2012-04-17

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The most common notation is

$A_s = \begin{cases} \ U & \text{if $A_{U_{Max}} = A_{U_{Min}} =$ Null},\\ \ \frac{A_{U_{Max}} - A_{U_{Min}}}{U\sqrt{2}} & \text{otherwise} \end{cases}$

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    @Rajeshwar I'm not sure if there is a common notation for this, although I'm sure you could tinker with the Iverson bracket to get this. However, for the sake of clarity, I would specify this fact in english before or after presenting the equation in whatever text you are writing.2012-04-18