following wffs are jointly satisfiable. If they are, then read off from your tree a model on which they are both true. (Hba →a = a) ∨(∃yy = y →c = c)

Database System Concepts
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Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
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Chapter1: Introduction
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Use a tree to test whether the following wffs are jointly satisfiable. If they are,
then read off from your tree a model on which they are both true.
(Hba →a = a) ∨(∃yy = y →c = c)
b = a ∧∃xx = x

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