100644 blob 55e9a3f8a0121040b6c3d281ff9c856e73cfc5d4	AbstractDifferenceDerivative.java
100644 blob 8a63cc4b6f1fc26685cbc9ba904cb53ed0f6062d	BackwardDifferenceDerivative.java
100644 blob 747e189c276af7cc25469a9ea0cd1876f3021c61	CenterDifferenceDerivative.java
100644 blob 511b26593f20b8bb428f47bdbd3da659cf651ab8	ForwardDifferenceDerivative.java