
1) Basic concept in set theory 2) Conifers, to trees 3) Group within a group 4) Included group 5) Math group within a group 6) Reduced number 7) Venn diagram part 8) Venn diagram representation
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https://www.crosswordclues.com/clue/subset

In mathematics, especially in set theory, a set A is a subset of a set B, or equivalently B is a superset of A, if A is `contained` inside B, that is, all elements of A are also elements of B. A and B may coincide. The relationship of one set being a subset of another is called inclusion or sometimes containment. The subset relation defines a pa.....
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http://en.wikipedia.org/wiki/Subset

(from the article `set theory`) As stated previously, a set is included in, or is a subset of, a set (symbolized by ) if every element of is an element of . So defined, a ...
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http://www.britannica.com/eb/a-z/s/178

[
n] - a set whose members are members of another set
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http://www.webdictionary.co.uk/definition.php?query=subset

A subset of a given set is a collection of things that belong to the original set. Every element of the subset must belong to the original set, but not every element of the original set need be in a subset (otherwise, a subset would always be identical to the set it came from).
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https://www.encyclo.co.uk/local/20687
noun a set whose members are members of another set; a set contained within another set
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https://www.encyclo.co.uk/local/20974

a set that is a part of a larger set. · a set consisting of elements of a given set that can be the same as the given set or smaller.
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https://www.infoplease.com/dictionary/subset

a subsidiary collection of objects that all belong to, or is contained in, an original given set, e.g. subsets of {a, b} could include
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https://www.storyofmathematics.com/glossary.html
No exact match found.