Definition:Sequent

Definition
A sequent is an expression in the form:


 * $$\phi_1, \phi_2, \ldots, \phi_n \vdash \psi$$

where $$\phi_1, \phi_2, \ldots, \phi_n$$ are premises (any number of them), and $$\psi$$ the conclusion (only one), of an argument.