wderiv-library.md

@@ -19,3 +19,7 @@ Generic name of a function is `wderiv_operation_xd_t`, where:
   * `3` for 3D problems
 * `t`:
   * `r` for real problems 
+  * `c` for complex problems 
+
+
+Example: `wderiv_dfdx_3d_r`, `wderiv_laplace_2d_c`, ...
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