on of a loop in a programming language using formal methods.',
            class: 'small',
            latex: `\\begin{matrix}
  \\alpha\\in p(DO)
      \\quad\\Longleftrightarrow\\quad
      DO(\\alpha)\\subseteq A^\\ast\\\\
  \\Updownarrow\\\\
  DO(\\alpha)=\\begin{cases}
      \\{\\langle\\alpha\\rangle\\},
          &\\mathop{ha}\\neg\\pi(\\alpha)\\\\

      \\{\\alpha\\in A^\\ast \\mid \\exists n\\in\\mathbb{N}
          \\;\\colon\\;\\
          \\alpha=\\chi_n(\\alpha^1,\\ldots,\\alpha^n)\\wedge&\\\\