This model has been extended to mathematics by Jahnke (Steiner, 1987). Such
approaches admitting practical knowledge or its applications into the traditional
domain of knowledge thus parallel aspects of the social constructivist proposals.
The social constructivist account of the nature and genesis of subjective
knowledge of mathematics is to a large extent based on the radical constructivism of
Glasersfeld (1984, 1989). This has parallels in the thought of Kant, and even more so,
Vico, as well as with the American pragmatists and modern philosophers of science
cited above.