(thing) by vireo Fri Mar 09 2001 at 2:05:44
The sine integral is a function defined by: 

        /x
Si(x) = |  sin(t)/t dt
        /0

Since Si(infinity) = π/2, it is natural to define its complementary function: 

                      /inf
si(x) = π/2 - Si(x) = |    sin(t)/t dt
                      /x
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