Tensors.parseExpression("R_{\\mu}^{\\mu}= R")
};
Expression kronecker = (Expression) Tensors.parse("d_{\\mu}^{\\mu}=4");
Transformation n2 = new SqrSubs(Tensors.parseSimple("n_\\mu")), n2Transformer = new Transformer(TraverseState.Leaving, new Transformation[]{n2});
Transformation[] common = new Transformation[]{EliminateMetricsTransformation.ELIMINATE_METRICS, n2Transformer, kronecker};
Transformation[] all = ArraysUtils.addAll(common, riemansSubstitutions);
Tensor temp;
//Calculating Delta- tensors