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May 3 at 23:28 answer added user479223 timeline score: 2
Jan 21, 2019 at 18:27 comment added Martin Hairer This is discussed in various places, like for example the introduction of my lecture notes hairer.org/notes/RoughPaths.pdf. Basically, it's just the closure of plain old smooth functions in a weak topology that's still strong enough for solutions to ODEs to be continuous.
Jan 21, 2019 at 16:19 history asked James Baxter CC BY-SA 4.0