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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
Accepted
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 …
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 …
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 * …
12
votes
Accepted
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. …
3
votes
Accepted
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 …
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 …
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 …