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  text: 'We also can work with negations to create a valid argument:\n\n>  $ \\begin{array}{l}\n\\text{If Socrates is a fish, then Socrates can live underwater.}  \\\\\n\\text{Socrates cannot live underwater.} \\\\\\hline\n\\text{Therefore, Socrates is not a fish.} \n\\end{array} $\n\nAlso known as *law of contrapositive* or *denying the consequent*, modus tollens works by reversing modus ponens. Formally,\n\n> $ \\begin{array}{l}\nA \\rightarrow B \\\\\n\\neg B \\\\\\hline\n\\therefore \\neg A\n\\end{array} $',
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