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Apr 24, 2016 at 20:02 vote accept Sam Roberts
Apr 23, 2016 at 19:25 comment added Sam Roberts Thanks for this! The proof is out of my comfort zone, so I'll leave it open for another day and accept if no one objects. (I take assignment functions to be maps from $\omega$ to $V$. Effectively, this gives us an assignment to the variables, since we can take it to assign $a(0)$ to the least variable, $a(1)$ to the next, etc (relative to some salient well-ordering of the variables)).
Apr 23, 2016 at 10:00 history edited user57888 CC BY-SA 3.0
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Apr 23, 2016 at 9:54 history answered user57888 CC BY-SA 3.0