# File lib/asciidoctor/converter/manpage.rb, line 373
    def stem node
      title_element = node.title? ? %(.sp
.B #{manify node.title}
.br) : nil
      open, close = BLOCK_MATH_DELIMITERS[node.style.to_sym]

      unless ((equation = node.content).start_with? open) && (equation.end_with? close)
        equation = %(#{open}#{equation}#{close})
      end

      %(#{title_element}#{equation})
    end