TY JOUR TI Yves Klein and the Problem of Defining Art KW western art of the twentieth century KW french artists KW Yves Klein KW new realism KW neo-dadaism KW conceptual art KW minimalism KW the problem of art definition JO Journal of Philosophical Research AU Kudrin, S.K. AU Vahrina, A.V. PY 2021 IS 7 PB INFRA-M Academic Publishing LLC.