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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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What is the name of a certain subset in a poset?

Is there a name for a subset $\{x_i\}$ of a poset $(P,\leq)$ satisfying $x_1 \leq x_2 \geq x_3 \leq \cdots \geq x_{n-1} \leq x_n$? (The subset could be infinite and the inequalities could be strict.) I'm quite sure there's a name for this (although…
Abel
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Pi is the circumference over the radius?

Pi is the circumference over the radius and the radius half of the circle so what is a full circle? I know it starts with "D" and I tried a 100 words but I don't know it. Please help, I'm just a 5th grader learning about pi.
David
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Semantic question about chirality

Is it enough to generally say that an object is (or is not) chiral in some space/some number of dimensions according to some convention, or is some sort of structure or description of how it is chiral usually recommended/required (at least…
kevin
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Mapping a set of sets to a partitioning.

I've been experimenting with the following idea, and I wondered if there's a name for it: Suppose $S_0, S_1, ... S_{n-1}$ is an array of $n$ sets of elements in $U$. Now for any element $e \in U$ we can test whether or not $(e \in S_0), (e \in S_1),…
tangentstorm
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Is there a specific name for $\omega$?

Is there a name for this ordinal $\omega$, just like its cardinal $\aleph_0$ has a name "aleph null set"? Whenever I do my assignment about cardinality of sets (not in set theory class), if I want to make my proof precise, I introduce $\omega$ as…
John. p
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How would describe the proportionality of $y={k*a^x}$? Is it "exponentially proportional"?

Zipf's law states that given some corpus of natural language utterances, the frequency of any word is inversely proportional to its rank in the frequency table. So I understand "inversely proportional" to mean the frequency of a word of a given…
Sled
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Pythagorean "Lemma"

It is known that a theorem is a crucial result that solves many problems in a given field, and a lemma is a claim that holds for proving other important results. We all know the Pythagoras Theorem, and we know that this theorem helps us prove a lot…
Emo
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Terminology: Projection, truncation, elimination

Is there a special or distinct term for a projection that is essentially just a 'truncation', i.e. a projection that simply eliminates some number of dimensions? For example the projection $P=[I_2 \; \; 0 ]$ (for $I_2$ the 2 dimensional identity…
Dovetailed
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Name for percent "distance" of the "length" of interval?

Suppose we have an interval $[x_{min}, x_{max}]$ (where $x_{min} \gt x_{max}$) and a quantity $x$ that is a member of this interval. Is there a name for the following quantity? $\frac{x - x_{min}}{x_{max} - x_{min}}$ The best way I can describe this…
jpmc26
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How can I mathematically read this map $f:A\longrightarrow B$?

In Group Theory I found a "$f:A\longrightarrow B$" but I don’t know how to pronounce this term in English. I know there is a mathematical term for ":" and "$\longrightarrow$" in the map "$f:A\longrightarrow B$". Can anyone tell me that?
Sathiya Kumar V M
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What are these sets of Pythagorean triples called?

There are sets of Pythagorean triples $$ \{ a, b, c\} $$ where any pair of numbers is relative prime, like {3, 4, 5} and {5, 12, 13}, and there are sets with common factors $$ \{ n \cdot a, n \cdot b, n \cdot c \} $$ like the obvious {6, 8, 10} or…
stevenvh
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Elementary proof.

What actually elementary proof means ? If there is an elementary proof for a conjecture , then is it a theorem ? I saw papers on some conjectures proving stating as elementary proof. Then it means the conjecture is proved ? Is there any site that…
hanugm
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What is the sum of all pairwise products of a number's digits called?

I'm looking for something like this and I want to know how it's called; I'm pretty sure there is a term for it. I will show an example: Let's say we take the number 9876. $$x=9\cdot8+9\cdot7+9\cdot6+8\cdot7+8\cdot6+7\cdot6$$ You can see I multiply…
Templar
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Names for certain numbers.

I am wondering if there is names for numbers with the following characteristics: Numbers that end with 0. Numbers divisible by 5. If there are names for numbers with similar characteristics, I would be happy to learn about them as well.…
Learner
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Equality among multiple numbers?

When I have two numbers and they are the same, we can say that they possess "equality". Let's say I have three or four numbers and they are all the same. What do we call the quality that they possess? Can we say that the three numbers possess…
damat-perdigannat
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