English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Tools annual

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools monthly

Global: Zendy Plus monthly

Presents the access of premium content as premium feature

Premium Content

Global: Zendy Plus annual

Global: Zendy Free Plan

We give a new interpretation of the derangement numbers d_n as the sum of thevalues of the largest fixed points of all non-derangements of length n-1. Wealso show that the analogous sum for the smallest fixed points equals thenumber of permutations of length n with at least two fixed points. We provideanalytic and bijective proofs of both results, as well as a new recurrence forthe derangement numbers.

The largest and the smallest fixed points of permutations