 The next set of concepts we need to understand the structure of hypotheses that can be settled by reliable inquiry are the notions of  verifiable and  falsifiable  hypotheses. The verifiability and falsifiability of claims have been extensively discussed in epistemology and the philosophy of science, especially by philosophers concerned with issues in logical empiricism. This subsection describes how these concepts are used in learning theory, then compares the learning-theoretic concepts with discussions in broader epistemology.