Estimation of 2-norm bounds for two types of special matrices
The 2-norm of a matrix is a method of measuring matrices,which has important applications in numerical calculations,optimization problems,machine learning,and other fields.Therefore,firstly,sev-eral square sum formulas of Pell and Pell-Lucas numbers are derived.Secondly,Hankel-Hessenberg and Toeplitz-Hessenberg matrices with Pell or Pell-Lucas numbers as elements are constructed.Finally,the upper and lower bounds of the 2-norm of two matrices are discussed.