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Questions tagged [notation]

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

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93 views

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 <...
365 views

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 ...
92 views

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.
62 views

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" ...
53 views

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 ...
309 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 \...
47 views

334 views

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 ...
283 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 $c1, d1$ ...
740 views

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What is the Haskell-style type signature called (i.e., who is it named after)?

A type signature in Haskell is written in the following format: functionName :: arg1Type -> arg2Type -> returnType There's a (hyphenated, after a person or ...
932 views

What does up arrow ($\uparrow$) mean in pseudocode?

I'm learning vantage point trees, and I met this while reading the paper Data Structures and Algorithms for Nearest Neighbor Search in General Metric Spaces by Peter Yianilos (Proceedings of SODA 1993,...
Assume that $L$ is a language, is there any established notation that means that $L$ is infinite or empty?