final int argPosition, final int order) { if (!derivativeIndices.getStructureOfIndices().equals(parent.argIndices[argPosition].getInverted().getStructureOfIndices().pow(order))) throw new IllegalArgumentException("Illegal derivative indices.");
final int argPosition, final int order) { if (!derivativeIndices.getStructureOfIndices().equals(parent.argIndices[argPosition].getInverted().getStructureOfIndices().pow(order))) throw new IllegalArgumentException("Illegal derivative indices.");