This is the 8127th most frequent Russian word.
леманн
"Леманн" does not appear to be a standard Russian word. It could be a proper noun, surname, or misspelling.
The word 'леманн' is used as a proper noun to denote a person's name in this context.
Леманн был великим физиком, который доказал множество теорий.
Lemann was a great physicist who proved many theories.
Here, 'леманн' refers to a theorist or scientist whose work is being discussed.
На конференции обсуждали новую теорию Леманна о космосе.
At the conference, they discussed Lemann's new theory about space.
In this case, 'леманн' signifies the author or the main subject associated with the book.