úÎ k l    (c) Masahiro Sakai 2013 BSD-stylemasahiro.sakai@gmail.com provisional9non-portable (FlexibleInstances, DeriveDataTypeable, CPP) Safe-Inferred+24 Signs of real numbers.positivezeronegativeUnary negation.Absolute value.Multiplication.Reciprocal fraction.Fractional division. Exponentiation s^x.Note that we define    0 =  assuming 0^0 = 1. Sign of a number. Mnemonic symbol of a number.This function returns "-", "0", "+" respectively for , , .           sign-0.4.2 Data.SignSignPosZeroNegnegateabsmultrecipdivpowsignOfsymbol$fFractionalSet$fNumSet$fEnumerableSign $fFiniteSign$fUniverseSign$fHashableSign $fNFDataSign