Linear representation theory of cyclic group:Z3: Difference between revisions
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===Character table=== | ===Character table=== | ||
Let <math>\omega</math> be a primitive cube root of unity. | Let <math>\omega</math> be a primitive cube root of unity. In terms of the <math>i</math>-notation, <math>\omega</math> can be taken as <math>e^{2\pi i/3}</math> or <math>\cos(2\pi/3) + i\sin(2\pi/3)</math>, which is <math>(-1 + i\sqrt{3})/2</math>. <math>\omega^2</math> is the other primitive cube root of unity, and is given as <math>e^{-2\pi i/3}</math> or <math>\cos(2\pi/3) - i\sin(2\pi/3)</math> or <math>(-1 - i\sqrt{3))/2</math>. | ||
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Revision as of 22:20, 3 February 2011
This article gives specific information, namely, linear representation theory, about a particular group, namely: cyclic group:Z3.
View linear representation theory of particular groups | View other specific information about cyclic group:Z3
Over the complex numbers
The cyclic group of order three, being an Abelian group, has the property that all its irreducible representations are one-dimensional, and all representations are thus completely reducible in terms of one-dimensional representations. There are three irreducible representations, the trivial representation, and two representations sending the generators to the cube roots of unity, in different orders.
Character table
Let be a primitive cube root of unity. In terms of the -notation, can be taken as or , which is . is the other primitive cube root of unity, and is given as or or Failed to parse (syntax error): {\displaystyle (-1 - i\sqrt{3))/2} .
| Representation/Conjugacy class | (identity element) | (generator) | (generator) |
|---|---|---|---|
| trivial representation | 1 | 1 | 1 |
| one nontrivial representation | 1 | ||
| the other (conjugate) nontrivial representation | 1 |