A simple proof that the concordance group of algebraically slice knots is infinitely generated
Abstract: A simple proof of the result stated in the title is obtained by making the Casson-Gordon invariant additive.
-  A. J. Casson and C. McA. Gordon, Cobordism of classical knots, Mimeographed notes, Orsay, France, 1975.
-  A. J. Casson and C. McA. Gordon, On slice knots in dimension three, Algebraic and geometric topology (Proc. Sympos. Pure Math., Stanford Univ., Stanford, Calif., 1976) Proc. Sympos. Pure Math., XXXII, Amer. Math. Soc., Providence, R.I., 1978, pp. 39–53. MR 520521
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