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Subscripts in RSolve

Posted 10 years ago

Suppose we have the following equation: $$ gmam=rma{m-1} $$ with initial condition $a_L=d$ and $L$ might be negative.

The following command

RSolve[{g[m] a[m] == r[m] a[m - 1], a[-10] == d}, a, m]

gives me

{{a -> Function[{m}, 
  d*Product[r[1 + K[1]]/g[1 + K[1]], {K[1], 0, -1 + m}]]
}}

where K[1] runs from 0 to $m-1$. But shouldn't K[1] runs from -10 to $m-1$?

POSTED BY: Degang Wu
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