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English

Nevertheless, the practice remained known only to a few until the early 1980s, when some discoveries of an Israeli school teacher Avraham Oren came to the attention of the mathematician Eliyahu Rips at the Hebrew University of Jerusalem.

Indonesian

Namun, praktik ini terus dilakukan oleh sedikit orang sampai awal tahun 1980-an, ketika sejumlah penemuan seorang guru sekolah Israel, Avraham Oren, menarik perhatian ahli matematika Eliyahu Rips pada Hebrew University di Yerusalem.