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Model semantics for first-order predicate logic is characterized by a visualinference tool called semantic forcing trees for predicate logic. Formulas thatare valid (or invalid) by semantic forcing trees match valid (or invalid)formulas by the usual valuation semantics. In the event that the formula isinvalid by a forcing tree, a model that refutes it is determined by the marksof the leaves of this tree.

Arboles de Forzamiento Sem\'antico para la Logica de Predicados