theorem
for
C being non
empty compact non
horizontal non
vertical Subset of
(TOP-REAL 2) for
n being
Nat for
f being
FinSequence of
(TOP-REAL 2) st
f is_sequence_on Gauge (
C,
n) &
len f > 1 holds
for
i1,
j1 being
Nat st
front_left_cell (
f,
((len f) -' 1),
(Gauge (C,n)))
meets C &
[i1,j1] in Indices (Gauge (C,n)) &
f /. ((len f) -' 1) = (Gauge (C,n)) * (
i1,
j1) &
[i1,(j1 + 1)] in Indices (Gauge (C,n)) &
f /. (len f) = (Gauge (C,n)) * (
i1,
(j1 + 1)) holds
[i1,(j1 + 2)] in Indices (Gauge (C,n))