Lógica, 2: Sistema lógico, proposición, validez

Round-11 hunt: picked; channel-level screens (sellers/exam/re-upload/devotional/vendor/events), provenance check and vendor/seller/devotional recheck passed; strict per-title check + final strict pass; oEmbed verified.

A 92-minute video from Carlos Romero: “Lógica, 2: Sistema lógico, proposición, validez”.

Video by Carlos Romero, played through YouTube's embedded player.