👉 Presubsistent is a concept in linguistics and philosophy that refers to a situation where two or more sentences are logically equivalent but cannot be derived from each other by any valid means. This condition occurs when one sentence cannot be derived from another without violating its own consistency, meaning it does not satisfy the properties of validity and truthfulness. Presubsistent relationships can arise in many different contexts, such as logical deduction in formal logic, proof theory, or even philosophical arguments. They are often encountered in theories