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@MisterMikkel
I've tried both the heat and coke solution to no avail - and honestly, you could end up doing some damage to braze-ons and the seat tube if you're not careful.
One method I've heard of, but not yet tried myself, is drilling a hole in the bottom bracket (good for drainage purposes too) and then wacking the seatpost from below with a long rod and a hammer. Possibly after having soaked it in penetrating oil.