## Tags - Part of: - Related: - Includes: - Additional: ## Definitions - Complying with, or not complying with, some [[Set Theory|set]] of requirements ([[rule|rules]]). ## Main resources - [Formal - Wikipedia](https://en.wikipedia.org/wiki/Formal) - <iframe src="https://en.wikipedia.org/wiki/" allow="fullscreen" allowfullscreen="" style="height:100%;width:100%; aspect-ratio: 16 / 5; "></iframe>