Linked from
The 20 pages that link to Arthur Cayley, each with the reason it gives.
Group theoryRelated: His work helped define groups independently of permutations.
GroupRelated: Cayley helped shift groups from permutations to an abstract axiomatic structure.
Invariant theoryRelated: Cayley developed symbolic techniques for calculating invariants of forms.
Cayley's theoremRelated: Cayley gave the theorem its name through his work on abstract groups.
Cayley's formulaRelated: The formula bears his name and appeared in his work on tree enumeration.