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 Plus annual

Presents the access of premium content as premium feature

Premium Content

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 Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

W. B. Jordan's conclusion that the quadruple principal value integral inproblem 89-2 vanishes does not hold. The error sneaks in through a contributionof a subintegral which impedes some sign symmetry with respect to the masterparameter (the Fermi radius) and which was overlooked in the publishedsolution. In summary, the original problem of solving the quadruple integralremains unsolved.

Erratum to "Solutions problem 89-2: On the principal value of a quadruple integral", SIAM Rev. 32 (1990) 143