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Sep 16, 2019 at 10:28 comment added HJRW @JoelHass: Indeed. I haven't yet encountered anyone who understands the proof, though (and I haven't spoken to Vlad himself about it).
Sep 14, 2019 at 2:32 comment added Joel Hass There appears to be a proof. See Vlad Markovic Harmonic surfaces in 3-manifolds and the Simple Loop Theorem, at its.caltech.edu/~markovic/preprints.html
Dec 5, 2015 at 21:22 vote accept Daniel Moskovich
Dec 1, 2015 at 9:27 comment added HJRW Right. I only wanted to describe the understanding as 'fairly complete' because the SLC wouldn't say anything about $\pi_1$-injective surfaces. Somehow, the Makanin--Razborov framework only classifies the kernel, not the image.
Nov 30, 2015 at 21:58 comment added Ian Agol The "fairly complete understanding" would mean something like: every map of a surface is obtained (up to homotopy) by a map of a $\pi_1$-injective surface with some handles attached along maps of arcs in the manifold with endpoints on the surface.
Nov 30, 2015 at 21:39 history edited HJRW CC BY-SA 3.0
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Nov 30, 2015 at 21:27 history answered HJRW CC BY-SA 3.0