History of engineering & technology fractional differential equations Adomian method B-spline scheme BTC Fractional calculus Fractional dynamics Gf-bonvexity/Gf-pseudobonvexity IT service IT services catalog IT services portfolio Kirchhoff index Laplacian spectra Metzler matrix Moore–Penrose pseudoinverse Nanotubes NoSQL databases Oracle NoSQL P system SAT problem Zagreb polynomials anisotropic hölder regularity anisotropic scaling function asymmetric penalty sparse decomposition (APSD) attraction basins big data categorical product complex q-rung orthopair fuzzy graphs complex q-rung orthopair fuzzy hypergraphs complex q-rung orthopair fuzzy set