Assertion: japanese abacus | /r/HasProperty | developed by famous mathematician
Facets:
value: further
type: DEGREE
Source sentences:
text: Due to its complexity, it was replaced by Soroban, a Japanese abacus, which was developed further by a famous mathematician Seki Kowa who removed one bead each from upper and lower decks to make it 1 bead in the upper section and 4 beads in the lower section.
text: The Suanpan, one of the modern age abaci which was a Chinese abacus had 2/5 decks and due to its complexity was replaced by Soroban abacus, a Japanese abacus, which was developed further by a famous mathematician Seki Kowa who removed one bead each from upper and lower decks to make it 1/4 decks.