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autom
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AutomataTheory
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1
1
2
1.
T:
Type
2.
as:
T*
3.
u:
T
4.
v:
T*
5.
firstn(||v||;v) = v
firstn(||u.v||;u.v) = u.v
By:
RecUnfold `firstn` 0
THEN
Reduce 0
Generated subgoal:
1
if 0 <
||v||+1
u.firstn(||v||+1-1;v) else nil fi = u.v
About:
if 0 < 
||v||+1
u.firstn(||v||+1-1;v) else nil fi = u.v firstn(||u.v||;u.v) = u.v if 0 < ||v||+1 u.firstn(||v||+1-1;v) else nil fi = u.v
