return the difference between the derivation operators of the leaders of two differential polynomials
delta_leader (p, q, R)
differential polynomial ring
Important: The diffalg package has been deprecated. Use the superseding package DifferentialAlgebra instead.
Let fp and fq denote the leaders of p and q. The function delta_leader returns a sequence, if it exists, of derivations s such that fp = differentiate (fq, s, R).
The function returns FAIL if p or q belongs to the ground field of R or if fp and fq are derivatives of different differential indeterminates.
The command with(diffalg,delta_leader) allows the use of the abbreviated form of this command.
R ≔ differential_ring⁡derivations=x,y,ranking=u
R ≔ PDE_ring
p ≔ ux,x,y2−4⁢u
q ≔ ux
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