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ferret123
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Homework Statement
Complete the character table giving a brief explanation of each step.
Hint: You should use the fact that some representations are one dimensional.
2. The attempt at a solution
Reading through Mathematical Methods for Physics and Engineering by Riley, Hobson & Bence section 25.8 is on the construction of a character table. It gives a set of properties of a group that can be used to determine the character table.
One of these properties is that the identity irreducible representation is always present in a character table and all it's entries are 1. This implies that the 4th irreducible representation must be this identity by elimination.
Another is that the ‘vector’ formed by the characters from a given irreducible representation is orthogonal to the ‘vector’ formed by the characters from a different irreducible representation. Using this and performing a dot product between the newly determined 4th row and the 5th row, which is 0 by orthogonality, I determine that the missing entry must be 1.
Is this a correct method that I can use to determine the rest of the unknowns?
Thanks