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		/// Construct a Mat2x2f from four scalars.
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    /// Construct a Mat2x2f from four scalars.
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		ArithSqMat2x2Float(ScalarType a, ScalarType b,
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    ArithSqMat2x2Float(ScalarType a, ScalarType b,
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											 ScalarType c, ScalarType d):
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		       ScalarType c, ScalarType d):
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			ArithSqMatFloat<V, M, 2>(V(a,b),V(c,d)) {}
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      ArithSqMatFloat<V, M, 2>(V(a,b),V(c,d)) {}
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		/// Construct the 0 matrix
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    /// Construct the NAN matrix
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		ArithSqMat2x2Float() {}
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    ArithSqMat2x2Float() {}
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    /// Construct a matrix from a single scalar value.
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    explicit ArithSqMat2x2Float(ScalarType a):
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      ArithSqMatFloat<V, M, 2>(a) {}
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	};
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  };
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	/** Compute the determinant of a Mat2x2f. This function is faster than
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  /** Compute the determinant of a Mat2x2f. This function is faster than
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			the generic determinant function for ArithSqMat */
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      the generic determinant function for ArithSqMat */
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	template<class V, class M>
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  template<class V, class M>
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	}
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  }
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	template<class V, class M>
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  template<class V, class M>
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	const M invert(const ArithSqMat2x2Float<V,M>& m)
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  const M invert(const ArithSqMat2x2Float<V,M>& m)
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	{
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  {
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		float det = determinant(m);
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    typename M::ScalarType det = determinant(m);
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		if( !is_tiny(fabs(det)))
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    if( !is_tiny(fabs(det)))
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			{
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      {
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				return M(m[1][1]/det, -m[0][1]/det,-m[1][0]/det, m[0][0]/det);
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	return M(m[1][1]/det, -m[0][1]/det,-m[1][0]/det, m[0][0]/det);
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			}
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      }
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		throw Mat2x2fException("Cannot invert matrix");
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    throw Mat2x2fException("Cannot invert matrix");