---
title: "Soundness"
description: "A valid argument whose premises are also all true. Soundness guarantees a true conclusion; validity alone does not."
last_updated: "2026-08-02"
---

# Soundness

A valid argument whose premises are also all true. Soundness guarantees a true conclusion; validity alone does not.

*Example: "All humans are mortal; Socrates is human; so Socrates is mortal" is sound: valid in form and true in every premise.*

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