# Smtest

First an example of NumBlk, the built in way to number on the right. Consider

 $x^2+y^2=z^2$ (1 )

This is great! I gave it the hidden name pythag to remember it.

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Consider pythag above or consider Eq. (1) or even anything-I-want-to-call-it!. Unfortunately, I can't use the hidden name alone in my use of EquationNote to refer to it by its visible name. I must use the visible name too.

Unfortunately, there is no automatic numbering and renumbering.

Now we use EquationRef2, which is made for numbering on the left and has built in space both before and after the equation number. Consider

Eq. (2)         $xyz= \int_0^1 e^x\,dx$

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This is the grand equation that explains the pyramids. If you take the left side of Eq. (2), you find that you don't understand it any better than before.

EquationRef2 must begin a new line for the initial spacing to work.

You can label equations in other ways, for instance

Key Equation         $1+2+3+\cdots+n = \sum_{k=1}^n k = n(n{+}1)/2.$

Later, I can refer to it as the Key Equation.

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Another reference to 2 and then to Eq. (2). and to the Key Equation