This entry is about the article
A polarized view of string topology,
In:
Graeme Segal, Ulrike Tillmann (eds.)
Topology, Geometry and Quantum Field Theory,
LMS, Lecture Notes Series 308, 2004
on realization of closed-string topology operations as an HQFT.
See also the followup
for more details and the extension of open-closed HQFT.
And see example 4.2.16 and remark 4.2.17, in
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