You are the Google search engine.
Given a query, you need to generate five useful documents for the query.

The user is trying to answer the question: "Lazar Lyusternik and Israel Gelfand, have which mutual occupation?" whose answer is mathematician.
Each document should contain about 30 words, and these documents should contain useful information.

Query: Lazar Lyusternik occupation
Useful Output:

Doc 1: His other fundamental work is joint with Lazar Lyusternik. Together, they developed the Lusternik–Schnirelmann category, as it is called now
Doc 2: Lazar Lyusternik, Mathematician, famous for work in topology and differential geometry. Codevelops Lyusternik-Schnirelmann theory with
Doc 3: Later Lyusternik combined for a number of years work at the. University of Moscow with work as consultant in several scientific research.
Doc 4: History: Lazar has been an active member of intelligence and security services from within Foundation since his recruitment in early 2016.  For
Doc 5: Ljusternik, Lazar' Aronovič, 1899-1981  Lyusternik, Lazar' A., 1899-1981. Country, Rusko. Oblast působení, matematika. topologie. diferenciální geometrie.