Quantizing a string in string theory

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ehrenfest said:
Can someone define the phrase "quantize a string"?
Quantizing a theory consists in two steps. One, the dynamic variables are turned into Hilbert space operators, and two the commutations relations among those operators are found.

Below equation (12.3) on page 207, it says:
Zwiebach said:
As a first step in defining a quantum theory of the light-cone relativistic string, we must give the list of Shrodinger operators.

Then, below equation (12.5) on the same page it says:
Zwiebach said:
Now we set up the commutation relations
And then the deed is done.
 
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