[For the following exercises, Ive abbreviated strings of quantifiers of the same type such as xyz simply as xyz.]
1. Use fully developed open branches of trees to construct interpretations (models) showing that the following sequents are incorrect.
a. xFxa, xGax |= x(Fxa & Gax)
c. xyFxy |= xFxx
e. x(Fx & yGxy), xy(Gxy Hx) |= x(Fx Hx)
g. x(yFxy yGxy), x(Hx yFxy) |= x(Hx yGxy)
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