It was in this work that his famous Chebyshev polynomials appeared for the first time but he later went on to develop a general theory of orthogonal polynomials.
Ito ay sa trabaho na ito na ang kanyang tanyag na Chebyshev polynomials lumitaw para sa ang unang panahon ngunit siya mamaya nagpunta sa upang bumuo ng isang pangkalahatang teorya ng orthogonal polynomials.