{math-operators} is about operators in math mode. These include sums, integrals and similar, text operators like sin, cos, etc.

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subnumcases and inline math [duplicate]

Code \usepackage{cases} \begin{subnumcases}{}\label{eq:regola_scelta_reject} \min \quad \sum_{j=1}^{H}x_jw_j & $\sum_{j=1}^{H}x_jw_j \geq W_L$ ...
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Subscript Bracket [duplicate]

Possible Duplicate: How to put a big bracket under different parts of a equation so that I could write e.g. a text specific to that part in the equation? Does anyone know how to code the ...
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how do you write the grad operator? [duplicate]

Possible Duplicate: How to look up a symbol? I can only get \div which is upside down. I tried typing \grad but no luck. Packages I am using: \usepackage[utf8x]{inputenc} ...
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How to write a dirac delta symbol in LaTeX? [duplicate]

Possible Duplicate: How to look up a symbol? I mean the squiggle d_{ij} Dirac Delta thing but I am not sure how to put the notation for it. Does anyone know?
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How to type hyperbolic secant (sech)? [duplicate]

Possible Duplicate: Define additional math operators to be typeset in roman I'm trying to type the sech (Hyperbolic Secant) in LaTeX, but when I do use \sech(z) it will be known as an ...
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How do I write this mathematical equation?

I want to write the shown mathematical equation in LaTeX but I am getting an error. Here this is not eta but it is n. The code which I am writing is \begin{equation} \Delta {E} + \frac{\omega^2 ...