Abstract
The electronic structure of a copper crystal was calculated in a basis of standard atomic and Slater functions (BSAF) and in a basis of functions with polynomial tails (BFPT). The accuracy of BFPT calculations even in their simplest version is comparable to that of BSAF calculations. The calculation demands less computing time because the new basis identically turns zero all matrix elements between the functions of the atoms that are wider apart than a certain specified distance.
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