Commutator of string oscillator modes in Zwiebach 12.5

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Homework Statement


zwiebach means calculate
1/4[\alpha_1^I \alpha_1^I, \alpha_{-1}^J \alpha_{-1}^J [/tex]

, right?

Homework Equations





The Attempt at a Solution

 
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ehrenfest said:
zwiebach means calculate
1/4[\alpha_1^I \alpha_1^I, \alpha_{-1}^J \alpha_{-1}^J [/tex]

, right?
Yes.
 

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