answering my own question

[Ben Bolker]

  expression(theta^{"+"})
  expression(theta^{"-"})
  expression({theta^{"+"}}(mu)})

  etc., work fine (once I actually *thought* about what the problem was)

 Ben B.

Benjamin Bolker          Dep't of Ecology and Evolutionary Biology,
ben@eno.princeton.edu    Princeton University
tel: (609) 258-6886,     fax: (609) 258-1334

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