Remarks

Short, focused remarks on philosophical questions adjacent to the formal material — the kind of conceptual fine print that motivates or interprets the technical pages.

Contents

1. Semantics and the Theory of Meaning — what it is for an expression to mean something: reference and truth-conditions, use and inferential role, the major theories (Frege, model-theoretic, verificationist, truth-conditional, use theories), and how mathematical/model-theoretic semantics relates to meaning in natural language.
2. Space and Time in Special Relativity — what time and space are and how each is measured once relativity replaces Newton's absolute time and space: time as the operational reading of a clock and proper length of a worldline, space as a frame-relative slice with proper length as its invariant, length contraction and the collapse of the universal "now" as two faces of relative simultaneity, and the causal structure that survives — the physical entry point to the Philosophy of Space and Time.
3. The Philosophy of Bell's Theorem — an experimental metaphysics in two movements: first a fully explicit derivation of the CHSH inequality, its quantum violation, and Tsirelson's bound; then the philosophical reckoning — what exactly is refuted ("local realism" vs. locality simpliciter), the Jarrett–Shimony split of locality into parameter- and outcome-independence ("passion, not action, at a distance"), the assumptions of measurement independence and free choice (superdeterminism, retrocausality), the experimental loopholes and their loophole-free closure, and the menu of interpretations sorted by which premise each sacrifices.