theorem Th32:
  for M being tabular FinSequence, i,j st [i,j] in Indices M holds
  1 <= i & i <= len M & 1 <= j & j <= width M
proof
  let M be tabular FinSequence, i,j;
  assume [i,j] in Indices M;
  then i in dom M & j in Seg width M by ZFMISC_1:87;
  hence thesis by FINSEQ_1:1,FINSEQ_3:25;
end;
