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8749
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\begin{isabelle}%
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\isanewline
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~~~~{"}prime(p)~{\isasymequiv}~1~<~p~{\isasymand}~((m~dvd~p)~{\isasymlongrightarrow}~(m=1~{\isasymor}~m=p)){"}%
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\begin{isamarkuptext}%
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\noindent\small
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where \isa{dvd} means ``divides''.
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Isabelle rejects this ``definition'' because of the extra \isa{m} on the
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right-hand side, which would introduce an inconsistency. (Why?) What you
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should have written is%
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\end{isamarkuptext}%
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~{"}prime(p)~{\isasymequiv}~1~<~p~{\isasymand}~({\isasymforall}m.~(m~dvd~p)~{\isasymlongrightarrow}~(m=1~{\isasymor}~m=p)){"}\end{isabelle}%
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