logic: unification of a formula - Mathematics Stack Exchange The Unification Algorithm is described at page 84 You have to recall the resolution calculus [page 29] : Resolution is a simple syntactic transformation applied to formulas From two given formulas in a resolution step (provided resolution is applicable to the formulas), a third formula is generated
Unification of an expression - Mathematics Stack Exchange Unification is not possible for these expressions I wanna know if this Unification failure isn't only due to the chosen Substitution ? For example why they didn't substitute: X f(a) and then X g(y) to get p(X,X) and p(X,X) ?
What is How to do Unification - Mathematics Stack Exchange In a now deleted answer, sunflower gave a unification algorithm which has an explicit rule to that effect: "The unification of two functors with different name or arity fails " From your comment under the question it seems you have access to textbooks with unification algorithms
The Langlands program for beginners - Mathematics Stack Exchange $\begingroup$ @ABC, Langlands isn't really a grand unified theory of mathematics - that's just something Edward Frenkel said to convey the importance of the work to convey the importance of the program to the interested non-expert
geometry - Equation of a 3D spiral - Mathematics Stack Exchange I want to know if a 3D spiral, that looks like this: can be approximated to any sort of geometric primitive that can be described with a known equation, like some sort of twisted cylinder I suppose
Why should faithfully flat descent preserve so many properties? I think that a "faithfully flat" morphism in algebraic geometry can be thought of as analogous to a surjective map of sets (maybe more accurately as something like a fibration with surjective image)