Def A & B == AB

is mentioned by

Thm* ll:(T List) List, n:||concat(ll)||. Thm* m:||ll||.  Thm* ||concat(firstn(m;ll))||n Thm* & n-||concat(firstn(m;ll))||<||ll[m]|| Thm* & concat(ll)[n] = ll[m][(n-||concat(firstn(m;ll))||)]	[select_concat]
Def strong-subtype(A;B) Def == (A r B) Def == & ({b:B| a:A. b = a  B } r A) Def == & (a1,a2:A. a1 = a2  B  a1 = a2)	[strong-subtype]

In prior sections: mb basic mb nat mb list 1 mb list 2

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