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

In his Comment, Els\"asser claims that the answer to my titular question isone, not four as I have it. He goes on to give the singular principle thatsupposedly captures the difference between a light-bulb and a laser:$g^{(2)}(\tau=0)=1$. His claim is unconsidered and wrong, his proposedprinciple is impossible to apply and, when corrected, redundant (it thenbecomes one of the four I list already), his arguments are manifestlymisdirected. My paper stands as is.

Reply to Els\"asser's Comment on "How many principles does it take to change a light bulb ... into a laser?"