Some others went further south via Aden to the Red Sea and Egypt. With the summer monsoon, these traders could bring their ships back home to the Indian ports. Other sailors crossed, as Sunil Amrith has shown — and Dalrymple uses his work — the Bay of Bengal to reach the new emerging urban centres in Myanmar and south-east Asia. These sailors and traders used the eastward monsoon. By the fifth century, they were pushing along the Straits of Malacca towards China. India was thus, in the ancient and early medieval period, an “economic fulcrum”.
Fibonacci, the Italian mathematician of the twelfth and thirteenth centuries who introduced the modus Indorum (known today as the Hindu-Arabic numeral system), was probably influenced by the ideas of Pingala, an Indian mathematician of the second and third centuries BCE. Ideas of architecture and sculpture and stories travelled eastwards into south-east Asia. Visiting south-east Asia in 1927, Rabindranath Tagore wrote – and Dalrymple quotes him – “Everywhere I could see India, yet I could not
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