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Finite groups · Representation

S4:sgnS_4:\quad \mathrm{sgn}S₄ irreducible representation sgn

A 1-dimensional ordinary complex irrep of S₄, of real type, with an exact character and executable tensor operations.

Executable coverageOrdinary complexCharacterIrreducible
Definition

The ordinary complex irreducible representation labeled sgn of S₄, specified by its character on the named conjugacy classes. Sign of a permutation

Definition sources
Complex dimension
11
Source and assumptions
Coefficient field
ℂ; characteristic zero
Source and assumptions

Representation identity

Categoryordinary-complex
Coefficient fieldC\mathbb C
Character on the named conjugacy classes
11(12)(12)(12)(34)(12)(34)(123)(123)(1234)(1234)
11−1-11111−1-1

This record specifies an abstract representation. A matrix basis and normalized invariant tensors are separate choices.

Reference properties

PropertyValueEvidence
Complex dimension11Sources
Coefficient fieldℂ; characteristic zeroSources
Frobenius–Schur typeRealSources
Frobenius–Schur indicator11Sources
Complex conjugate irrepsgnSources

Character and identity

This is an abstract ordinary complex representation. Its character, rather than its dimension alone, fixes its identity within the specified group and class convention. Columns use explicit cycle representatives, ordered 1,(12),(12)(34),(123),(1234). Here 3 is the standard permutation-minus-trivial representation; 3′ = sgn ⊗ 3 is the orientation-preserving cubic-rotation representation. [sources]

Tensor operations and physical use

Use the linked character workbench to count internal singlets and decompose tensor, symmetric, or exterior powers. Field statistics apply to the full label space, including Lorentz and species labels when present. A character decomposition does not specify normalized invariant tensors or Clebsch–Gordan coefficients. [sources]

Conventions and realization

The coefficient field is complex; real describes the Frobenius–Schur type of this complex irrep. Labels refer to the table published here, not an upstream row number. No matrix basis is selected. Convention profile: finite-ordinary-complex-v1. [sources]

Names and aliases

S₄ irrep sgn

Aliases identify the stated object under this record’s conventions. Type names and broader search terms are kept separate.

Related objects and maps

Claims and sources

Each assertion has a stable identifier within this record and a source locator or derivation. Cite the dataset edition when referring to a corrected or historical claim.

Definition

The ordinary complex irreducible representation labeled sgn of S₄, specified by its character on the named conjugacy classes. Sign of a permutation

representation:s-4-sgn#definition
Complex dimension

1

representation:s-4-sgn#dimension
Coefficient field

ℂ; characteristic zero

representation:s-4-sgn#field
Frobenius–Schur type

Real

representation:s-4-sgn#reality
Frobenius–Schur indicator

1

representation:s-4-sgn#indicator
Complex conjugate irrep

sgn

representation:s-4-sgn#conjugate
Character and identity

This is an abstract ordinary complex representation. Its character, rather than its dimension alone, fixes its identity within the specified group and class convention. Columns use explicit cycle representatives, ordered 1,(12),(12)(34),(123),(1234). Here 3 is the standard permutation-minus-trivial representation; 3′ = sgn ⊗ 3 is the orientation-preserving cubic-rotation representation.

representation:s-4-sgn#representations-1
Tensor operations and physical use

Use the linked character workbench to count internal singlets and decompose tensor, symmetric, or exterior powers. Field statistics apply to the full label space, including Lorentz and species labels when present. A character decomposition does not specify normalized invariant tensors or Clebsch–Gordan coefficients.

representation:s-4-sgn#physics-1
Conventions and realization

The coefficient field is complex; real describes the Frobenius–Schur type of this complex irrep. Labels refer to the table published here, not an upstream row number. No matrix basis is selected. Convention profile: finite-ordinary-complex-v1.

representation:s-4-sgn#conventions-1
Representation domain

group:s-4

representation:s-4-sgn#relation-1