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How to read a card

Every concept is a two-dimensional card. One axis defines it (what it is, what it is not, its essence, necessary conditions, common misconceptions); the other axis guides practice (how to deal with it, what to do, what to avoid, examples). Concepts form a tree, from broad ideas down to specific subtopics.

Knowledge card

Count n (factorial)

Symbol

Dimension I

Definition

What it is — and what it is not

No definition recorded yet.

Dimension II

In practice

How to deal with it

No practical guidance recorded yet.

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Encyclopedia

Count n (factorial)