with the work of giants of mathematics such
as Grothendieck (a leading figure in the creation of modern
algebraic geometry) and Langlands (a key figure in
representation theory), mathematics has seen a strong programme
of geometrization in which mathematicians engage
in studying the deformations of structure that lead to invariants
(Zalamea 2012), thus considerably extending Klein’s
(1872) Erlangen programme (characterising geometries
based on transformation groups; Gray 2005). In most countries,
the proportion of classroom time spent doing geometry
in school mathematics comes nowhere near the 90 %
that claimed by Dieudonné for mathematics. While the
discipline of mathematics need not prescribe the content
of school mathematics, the current enormous discrepancy
seems quite surprising and potentially a cause for concern
for the mathematics education of the future generation.