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Mathematica symbols are the ultimate atoms of symbolic data. Every symbol has a unique name, exists in a certain Mathematica context or namespace, and can have a variety of types of values and attributes.

18 votes
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How to create symbol whose name has subscript?

Although your question is stated clear, I'm still wondering whether you understood, that Subscript[\[Theta], 1] is not a symbol. It's a box-structure! Therefore, what you do when you assign it a value …
halirutan's user avatar
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6 votes
Accepted

Unevaluated symbols

In your example it is possible to assign a usage message although the variable has a value. Short example: var = 1; Function[v, v::usage = "blue", HoldFirst] @@ MakeExpression["var"] The trick is t …
halirutan's user avatar
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5 votes
Accepted

How do I write semidirect product symbol " ⋊ "?

Please be aware that these characters are not regarded as an operator but as part of the symbol. So if you use it in code and don't put a space between it, it will be one symbol Head[G⋊H] (* Symbol * …
halirutan's user avatar
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12 votes
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Generating a vector of dummy variables

It always gives you fresh, unused symbols. The other thing you should consider is, that x[1] can be used like a symbol too, although it isn't one. …
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3 votes
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Assigning symbolic operators to built-in functions

With the notation package something like this is easy. I would never use this by myself, because IMO such sugar can easily introduce bugs and undesired behavior if one is not cautious. I will paste a …
halirutan's user avatar
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2 votes

How to define a vector with automatically added symbolic elements with subscripts

Although I don't like the Notation stuff very much, I regard the question as very nice, because it offers some insight into the evaluation process. When you bind UpValues to the symbol k and k has Dow …
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5 votes
Accepted

Where to look up information about some symbols, such as ",", "[" and "]" (not string)?

I believe the documentation-page you are looking for is this here The Four Kinds of Bracketing in the Wolfram Language And for some further reading, you might want to look at The Syntax of the Wol …
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