reserve x,y,z for object,
  i,j,n,m for Nat,
  D for non empty set,
  s,t for FinSequence,
  a,a1,a2,b1,b2,d for Element of D,
  p, p1,p2,q,r for FinSequence of D;
reserve M,M1,M2 for Matrix of D;

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;
