math_mode=(opt) public

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# File lib/irb/ext/math-mode.rb, line 18
    def math_mode=(opt)
      if @math_mode == true && opt == false
        IRB.fail CantReturnToNormalMode
        return
      end

      @math_mode = opt
      if math_mode
        main.extend Math
        print "start math mode\n" if verbose?
      end
    end
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