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Questions tagged [terminology]

Questions on the usage and meaning of words in mathematics, the names for mathematical entities, and other such questions.

Terminology is a discipline that studies, among other things, the development of terms and their interrelationships. This tag is intended to be used for questions on the usage and meaning of words in mathematics, the names for mathematical entities, and other such questions.

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Range Terminology

How should the following statement be interpreted: Let $f$ be a function with range in* $[0,1]$. (Here the word "in" has been deliberately included.) In this context, the range is the same as the image. I've always taken the statement to mean…
adam
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What is it called when you have two systems of measurement and each scale has two different numbers that can represent the same thing?

I'd like to know what it is called in Math when you have two numbering systems and they represent the same thing, but with different numbers. Let me give you an example, when you have civilian and military time... You might have someone tell you…
leeand00
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Wording in English for "quantité conjuguée" in French

In French when you have an expression of the type $\sqrt{x}-\sqrt{y}$, the expression $\sqrt{x}+\sqrt{y}$ is named the "quantité conjuguée". This is useful when you want to bound $$\vert \sqrt{x}-\sqrt{y} \vert = \frac{\vert x-y…
mathcounterexamples.net
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What is the name of this similarity measure for sets?

just a quick question. Suppose I have two sets $A,\,B$. Is there a specific name for the following similarity measure? $$\operatorname{sim}(A,B) = \frac{|A \cap B|}{\max\{|A|,|B|\}}$$ It is slightly different from the Jaccard coefficient, but I…
Mikołaj Morzy
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Are there names for these subsets of rational numbers?

Rational numbers can be defined as: $$\left\{ \frac{p}{q} | p \in \Bbb{Z}; q \in \Bbb{Z}; q \neq 0 \right\}$$ Are there conventional or existing names for the sets where $q$ is a particular number? For example: $$\left\{ \frac{p}{4} | p \in…
Samuel Edwin Ward
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Term to describe breaking a number into its constituent digits?

I'm writing a program, and in this program is a method that takes a number (say, 1,337), and returns its digits (1, 3, 3, and 7). Is there a mathematical term that describes this process? If not, is there a word that at least describes a good part…
James M. Lay
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how to call a and b when a+b=1?

I guess it's a simple question, but it really escaped my memory. If $a + b =1$, then how can I call those $a$ and $b$ numbers? $a$ is not an inversion of $b$, and it's not reciprocal of $b$.. but I'm sure that they do have a 'name'.
Lil'Lobster
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What does "by what part" mean?

I have a homework problem that is asking me for something. Here's the last line quoted: If you switch to the ring, by what part will you decrease the electric field magnitude at P? Okay, so the only problem that I'm facing is that I'm not sure…
BigBoy.
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Casio Calculators Give 2 Different Answers

Possible Duplicate: What is 48÷2(9+3)? Sorry if this has already been asked, my searches were fruitless... There's been a buzz lately about the different results given by two different Casio brand calculators for the same expression. It would…
David
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How is this particular arithmetic expression called?

A normal arithmetic expression looks like this, right?: 3 + 5 * 3 + 14 / 7 The same expression written in Scheme looks like this: (+ 3 (* 5 3) (/ 14 7) ) How do I call it? Is there a name for such an unusual way of writing an arithmetic…
user229172
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What is the name of a number ending with zero's?

I am currently writing a very specific graph of a function implementation. The graph can have min/max values e.g. $134$ and $1876$ respectively. I'm calculating "nice" numbers. For min/max they are $100$ and $1900$ respectively. Is there a commonly…
Ruudjah
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What's the name of the sequence of differences?

Let $a = (a_0,a_1,a_2,\ldots)$ be an infinite sequence of real numbers. What is the name of the sequence \begin{equation*} Da = (a_1 - a_0, a_2 - a_1, a_3 - a_2, \ldots) \qquad ? \end{equation*} Also, is the operator $D$ called the "forward…
eternalGoldenBraid
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How do we say in English that pyramid is not skewed?

I would like to know if there is a term kind of "straight pyramid"? I mean, is there a word for a pyramid such that the line segment from the apex to the center of the base is perpendicular to the base.
studying
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How is the relation between $y$ and $x$ called in $y = 1/x$?

Probably a very simple question for most of you, but how is the relation called between $x$ and $y$ if $y = 1/x$? As in, if I want to say: $y$ is .... related to $x$, what should go on the dots? Update: Thank you all for your very quick responses!…
Tiddo
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sheaf of hyperplanes

I've got a question on terminology. In 3d, a set of planes intersecting at a point is called a bundle of planes. A set of planes intersecting along a line is called a sheaf of planes. My question concerns hyperplanes in 4d. What is the relevant…
Andrey
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