Free public beta until December 4, 2026: every course is open, no card needed. After that, the first chapter of each course stays free and full access is a one-time $39 ($19 for up to 100 founding members chosen for helpful feedback). Your progress is kept. How the beta works

logic

Diagramming joint premises

taught

Bracket premises that only support the conclusion together, with one shared arrow.

Taught in

Diagrams, independent and joint premises
Introduction to Logic

Requires

diagram-independent-premises required

Required by

Diagramming a longer argument from the top down required
The general-plus-particular premise pattern required

Local knowledge map

Local knowledge map

Click to expand

Solid arrows are required prerequisites; dashed are recommended or helpful. Lower rows are more foundational. Click any box to jump to that concept.