f notation (Table 9).

Table 9.  Higher Order Differential Features
o----------------------------------------o----------------------------------------o
|                                        |                                        |
| !A!   = d^0.!A! = {a_1, ..., a_n}      | E^0.!A!  = d^0.!A!                     |
|                                        |                                        |
| d!A!  = d^1.!A! = {da_1, ..., da_n}    | E^1.!A!  = d^0.!A! |_| d^1.!A!         |
|                       