}()
	return Z
}

// Reciprocal of a power series
//	let U = u + x*UU
//	let Z = z + x*ZZ
//	(u+x*UU)*(z+x*ZZ) = 1
//	z = 1/u
//	u*ZZ + z*UU +x*UU*ZZ = 0
//	ZZ = -UU*(z+x*ZZ)/u

func Recip(U PS) PS {
	Z := mkPS()
	go func() {
		ZZ := mkPS2()
		<-Z.req
		z := inv(get(U))
		Z.dat <- z
		split(Mul(Cmul(neg(z), U), Shift(z, ZZ[0])), ZZ)
		copy(ZZ[1], Z)
	}()
	return Z
}

	}(c, Z)
	return Z
}

// Reciprocal of a power series
//	let U = u + x*UU
//	let Z = z + x*ZZ
//	(u+x*UU)*(z+x*ZZ) = 1
//	z = 1/u
//	u*ZZ + z*UU +x*UU*ZZ = 0
//	ZZ = -UU*(z+x*ZZ)/u

func Recip(U PS) PS {
	Z := mkPS()
	go func(U, Z PS) {
		ZZ := mkPS2()
		<-Z.req
		z := inv(get(U))
		Z.dat <- z
		split(Mul(Cmul(neg(z), U), Shift(z, ZZ[0])), ZZ)
		copy(ZZ[1], Z)
	}(U, Z)
	return Z
}

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