subgroup

/'sʌbgru:p/

Thân thiện

A Venn diagram shows a large circle labeled "Group" containing a smaller circle labeled "Subgroup".

Definition

1. Noun:
   • A distinct and often subordinate group within a larger group: A smaller, more specific collection of members that share certain characteristics and is part of a larger, more general group.
   • (Mathematics) A subset of a mathematical group: In mathematics, a "subgroup" is a set within a group that itself satisfies all the properties of a group under the same operation.

Usage and Examples

• General Usage (a distinct group within a group):

  • The committee analyzed the survey results for each demographic subgroup, such as young adults and seniors.
  • Within the main political party, a reformist subgroup began advocating for new policies.

• Mathematical Usage:

  • The set of even integers forms a subgroup of the group of all integers under addition.
  • To solve the problem, we first need to identify all the normal subgroups of the given group.

Advanced Usage

• "to form a subgroup": to create or constitute a distinct smaller group.
  • The researchers asked participants to form subgroups based on their initial preferences.
• "proper subgroup" (Mathematics): a subgroup that is strictly smaller than the whole group (i.e., not equal to the group itself).
  • Every group has at least two subgroups: itself and the trivial subgroup containing only the identity element; any other subgroup is a proper subgroup.

Variants and Related Words

• Subset (n): A set of which all the elements are contained in another set. (Note: In mathematics, a "subgroup" is a specific type of subset with additional algebraic structure.)
• Faction (n): A small, organized, dissenting group within a larger one, often implying conflict. (This is a related but more specific social/political concept.)

Synonyms

• Subdivision: A part or section that is the result of dividing.
• Section: A distinct part or subdivision of something.
• Cohort: A group of people sharing a common statistical or demographic characteristic.

Antonyms

• Superset: (Mathematics) A set that includes all elements of another set.
• Whole group / Entire group: The complete, undivided group.

Related Phrases and Concepts

• "Break into subgroups": To divide a larger group into smaller, distinct groups.
  • For the workshop, the facilitator asked us to break into subgroups of four or five people.
• "Subgroup analysis": (Statistics/Research) The analysis of data from a predefined subset of participants within a larger study.
  • The paper included a subgroup analysis of patients over the age of 65.

Học thuật

Noun

1. (mathematics) a subset (that is not empty) of a mathematical group
2. a distinct and often subordinate group within a group