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{{Unreferenced|date=March 2007}}
'''Virasena''' was an [[8th century]] [[Indian mathematics|mathematician]] in [[India]] who gave the derivation of the [[volume]] of a [[frustum]] by a sort of infinite procedure. He also dealt with [[logarithm]]s to [[base 2]] (''ardhaccheda'') and knew its laws, and was also the first to deal with logarithms to [[base 3]] (''trakacheda'') and [[base 4]] (''caturthacheda'').
 
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