let f be non constant standard clockwise_oriented special_circular_sequence; :: thesis: for G being Go-board st f is_sequence_on G holds
for i, j, k being Element of NAT st 1 <= k & k + 1 <= len f & [i,j] in Indices G & [i,(j + 1)] in Indices G & f /. k = G * (i,j) & f /. (k + 1) = G * (i,(j + 1)) holds
i < len G
let G be Go-board; :: thesis: ( f is_sequence_on G implies for i, j, k being Element of NAT st 1 <= k & k + 1 <= len f & [i,j] in Indices G & [i,(j + 1)] in Indices G & f /. k = G * (i,j) & f /. (k + 1) = G * (i,(j + 1)) holds
i < len G )
assume A1: f is_sequence_on G ; :: thesis: for i, j, k being Element of NAT st 1 <= k & k + 1 <= len f & [i,j] in Indices G & [i,(j + 1)] in Indices G & f /. k = G * (i,j) & f /. (k + 1) = G * (i,(j + 1)) holds
i < len G
A2: L~ f is Bounded by JORDAN2C:65;
let i, j, k be Element of NAT ; :: thesis: ( 1 <= k & k + 1 <= len f & [i,j] in Indices G & [i,(j + 1)] in Indices G & f /. k = G * (i,j) & f /. (k + 1) = G * (i,(j + 1)) implies i < len G )
assume that
A3: ( 1 <= k & k + 1 <= len f ) and
A4: [i,j] in Indices G and
A5: ( [i,(j + 1)] in Indices G & f /. k = G * (i,j) & f /. (k + 1) = G * (i,(j + 1)) ) ; :: thesis: i < len G
assume A6: i >= len G ; :: thesis: contradiction
i <= len G by A4, MATRIX_1:38;
then A7: i = len G by A6, XXREAL_0:1;
A8: j <= width G by A4, MATRIX_1:38;
right_cell (f,k,G) = cell (G,i,j) by A1, A3, A4, A5, GOBRD13:22;
then not (right_cell (f,k,G)) \ (L~ f) is Bounded by A8, A7, A2, JORDAN1B:34, TOPREAL6:90;
then not RightComp f is Bounded by A1, A3, JORDAN2C:12, JORDAN9:27;
then not BDD (L~ f) is Bounded by GOBRD14:37;
hence contradiction by JORDAN2C:65, JORDAN2C:106; :: thesis: verum