What is the difference between a fact model and a domain ontology?

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Salaheddin J. Juneidi

Fact model is based on formal first order logic representation and has uniform solution that that can be reached by series of first order logic equations

On the other hand , domain ontology dos'nt provide a finite uniform solution but reaches to some range of solution domain

Alain Pereira Toledo

please, could you define what's a series of First Order Logic equations? Or simpler, what's a logical equation?