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Questions tagged [options]

Questions dealing with optional named arguments of Mathematica functions.

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Expression to disable internet to speed up Quantity

There's a way to disable internet or WolframAlpha connectivity. I know Quantity caches unit lookups, but I have reasons that I need to disable internet connectivity. Can someone help me with that ...
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How to make an index optional?

Can I define a relation between variables, such that the expression will also be evaluated (then assuming all indices are equal) when no index is given? $$ x_i + y_j = \delta_{ij} \stackrel{...