# Questions tagged [notation]

Use this tag whenever you have a question about what some particular symbol/notation means.

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### “Smallest set” term in the trees set definition

I often meet such kind of the definition of the set of trees, as: The set of unranked $\Sigma$-trees, denoted by $T$, is the smallest set of strings over $\Sigma$ and the parenthesis symbols ‘)’ and ‘...
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### What does it mean the norm symbol applied to a concept?

I'm reading this paper: http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.150.14 or http://www.jmlr.org/papers/volume10/kontorovich09a/kontorovich09a.pdf On page 1101 are introduced 2 functions ...
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### Where did our present regex notation originate?

First question, and my apologies if it is off-topic! This question suggests to me I may not be totally off-base. Where did our present regex notation originate? I am particularly wondering how <...
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### Addition modulo 2 notation (Quantum Computing)

I am studying Quantum Computing using the book Quantum Computation and Quantum Information of Michael Nielsen and Isaac Chuang. I am confused by the meaning of the $\oplus$ (addition modulo 2) symbol ...
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### How to negate this one?

How can I negate the following sentence: For all words x from L with |x|>= n , exists decomposition x = uvw with |uv| <= n and |v| >= 1, so for all i >= 0 , is valid that u(v)^iw in L is.
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### What do the commas separating atomic events in a Relational Calculus formula means?

For instance, take the example of this book here on page 30. About the formula $$Q(x,x') = R(x), S(x,y), S(x',y), R(x')$$ described there, what do the commas mean? Is it the same as an "and" ...
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### Trouble understanding Grammar Rules

I am totaly new to theoretical computer science, so I am sorry if I get the terminology wrong: I was reading the definition of a grammar, what I didn't get was the formal definition of the production ...
314 views

### Meaning of double colon $::$

I've came across this expression regarding function composition in some notes by people from computer science, and I don't know what the notation "$::$" means. \begin{equation} g \circ f : A \...
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### How to read 'max min' and 'min max'?

Here is an exercise I came across while studying MaxFlow / MinCut and I'm rather stumped: Designate $G = (V, E)$ as an undirected graph that has at least two vertices. Every edge $(e)$ on this ...
315 views

### How do I interpret this divide and conquer algorithm for removing duplicates in a list?

Consider the following divide and conquer algorithm to remove duplicates in a list. The text is in French. What is the meaning of the variables $c1, c2, d1, d2$? Why are only the variables $c1, d1$ ...
761 views