I am looking for a basic (preferably self-contained) reference where I can read about propagators (as they appear in Topology), and in particular Morse propagators.
Thanks!
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If this question still interests someone, the paper
A formula for the Θ–invariant from Heegaard diagrams, Geom Topol 2015, by Christine Lescop
explains what propagators are, and how to construct Morse propagators.
