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# FormalSeries * FormalSeries -- multiplication of formal series

- Operator: *
- Usage:
    `s * t`
- Inputs:
  - s, an instance of the type FormalSeries,
  - t, an instance of the type FormalSeries,
- Outputs:
  - an instance of the type FormalSeries, the product of the formal series s and t

## Description

    i1 : R=ZZ[x,y]

    o1 = R

    o1 : PolynomialRing

    i2 : s = series(x^2+x+y,2)

                       2
    o2 = FormalSeries{x  + x + y, 2}

    o2 : FormalSeries

    i3 : t = series(x+y+1,2)

    o3 = FormalSeries{x + y + 1, 2}

    o3 : FormalSeries

    i4 : s * t

                        2           2
    o4 = FormalSeries{2x  + 2x*y + y  + x + y, 2}

    o4 : FormalSeries

## Ways to use this method:

- FormalSeries * FormalSeries -- multiplication of formal series

The source of this document is in /build/macaulay2-88fgJW/macaulay2-1.25.11+ds/M2/Macaulay2/packages/FormalGroupLaws.m2:518:0.