n:. ||upto(n)|| ~ n 

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Definitions	P  Q, t  ...$L, as @ bs, ||as||, upto(n), SQType(T), {T}, S  T, {i..j}, Unit, P  Q, P & Q, i=j, , b, Prop, b, AB, A, False, ij, P  Q, x:A. B(x), t  T,
Lemmas	nat wf, nat properties, ge wf, assert wf, not wf, bnot wf, bool wf, eq int wf, assert of eq int, not functionality wrt iff, assert of bnot, iff transitivity, eqff to assert, eqtt to assert, upto wf, int seg wf, length wf1, le wf, append wf, non neg length, length cons, length nil, length append