A two-variable Chebyshev polynomial reconstruction of f(Q,T) gravity is shown to be algebraically identical to a truncated Taylor series, then fitted to Pantheon+SH0ES data.
On the Chebyshev approximation of a function with two variables
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abstract
There is presented an approach to find an approximation polynomial of a function with two variables based on the two dimensional discrete Fourier transform. The approximation polynomial is expressed through Chebyshev polynomials. There is given an uniform convergence result.
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Chebyshev cosmography in the framework of extended symmetric teleparallel theory
A two-variable Chebyshev polynomial reconstruction of f(Q,T) gravity is shown to be algebraically identical to a truncated Taylor series, then fitted to Pantheon+SH0ES data.