Given a sentence in Tagalog language, translate the sentence to English language keeping the meaning of the original sentence intact.

Tagalog sentence: Sa mga libro na naglalaman lamang ng 81 na pahina, Hopf na ginawa ng isang tiyak at matikas buod ng ergodic theory.
In that book containing only 81 pages, Hopf made a precise and elegant summary of ergodic theory.