Erdős problem 497 · problems.science

How many antichains in $[n]$ are there? That is, how many families of subsets of $[n]$ are there such that, if $\mathcal{F}$ is such a family and $A,B\in \mathcal{F}$ , then $A\not\subseteq B$ ?

Workspace

Continue locally Open source Sign in to contribute

Open this exact Problem, source revision, and authority Repository in Workbench. This handoff does not clone, switch, upload, or execute anything.

Canvas

public preview

Source#497
→
ResultNone
→
Checks0

Reported activity

Work these sources record against this Problem. Source-reported attribution, not reviewed here.

Formalization
Erdős AI contributions wiki · 4 Feb, 2026
Machine
Aristotle
Open the source record

Reported activity

Search problems.science