Answered
if i have L={a,d,r,s,t,u} , L1={d,r,s} , L2={r,d,s}
how i can make relation L1 & L is true ( since they have same elements with same order )
L2 & L is false ( because order not same in L) ?
The same question 
if i have L={a,d,r,s,t,u} , L1={d,r,s} , L2={r,d,s}
how i can make relation L1 & L is true ( since they have same elements with same order )
L2 & L is false ( because order not same in L) ?
are a,d,r,s names of numbers? is it L1==L2 if r==d? same elements means same values?
meantime try IsDefined(IndexOf(Take(FormulaText(L1, false, false), 8, Length(FormulaText(L1, false, false)) - 8), FormulaText(L, false, false)))
one possibility more
L\(L\L_n)==L_n
see also: https://wiki.geogebra.org/e...
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