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Im stuck trying to find simple formula to calculate derivative within a tree code.
Lets say for instance:
M
M1
M2
M11
M12
M111
M121
M122
M1111
M11111
M11112
M11 & M12 derivative from M1 & MM121 & M122 derivative from M12 & M1 & MM11111 & M11112 derivative from M1111 ; M111 ; M11 ; M1...