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@daveray
If you heat the frame with a blowtorch the steel will expand, yes, however alu expands at a lower temp so will effectively get more stuck until it melts, at which temp you have taken all the paint off the seat tube and possibly messed the frame's brazing. Heat + plumbers/electronic freeze spray down the seatpost plus twisting with seatpost in vice or pole through an old saddle and you'll be all good I reckon. Hard work, but in my experience worth it. In war though, there are always losers. Hopefully just a seatpost in this case. Oh and the heat will bake the paint a sort of yellowy colour. If you're gonna repaint it anyway just melt it out.