In Iran, it is named after Omar Khayyam, In China after Yang Hui and in Italy after Niccolò Fontana Tartaglia.
The earliest explicit depictions occur in the 10th century in commentaries on the Chandas Shastra (an ancient Indian book on Sanskrit prosody written by Pingala)
by Halayudha – who used it to explain obscure references to Meru-prastaara, the "Staircase of Mount Meru“.
What mathematical artifact am I talking about?
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