Abstract
We show explicitly that the sum over punctures for the three-times derivative for the Penner free energy , given by D. A. Johnston [], is not correct. As a consequence, Eq. (21), the differentiated version for the renormalization group (RG) equation, is wrong. Also, his conclusion that the differentiated version of the RG equation for the three-times derivative of the free energy can be obtained from the higher genus RG equation cannot be true. Finally, the differentiated version of the RG equation is extended to any derivative of the free energy .
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