read LEON: print(`A basis for the homogeneous polynomials annihilated by the operators`): print(D1^4+D2^4+D3^4,D1^3+D2^3+D3^3): print(`of degree<=4.`): print(`is: `): print(PolSolsH([D1^4+D2^4+D3^4,D1^3+D2^3+D3^3],[x1,x2,x3],[D1,D2,D3],4)): print(`This took `, time() , `seconds `):