Recent remarks on the possibility of negative-pion condensation in superdense nuclear matter are shown to be based on an incorrect formalism. The possibilities of ${\pi }^{-}$ and ${\pi }^0$ condensation are compared and some problems are enumerated which must be solved before it is known which, if either, of the phenomena can occur.

• Received 14 September 1973

DOI:https://doi.org/10.1103/PhysRevLett.31.1556