The change of figure in the line is denoted by an Arabic nokta (a sign like the diamond in a pack of cards); and this, though very clear for 0's, leaves the other figures unchanged, […]
Let H be a traversal of an undirected graph G = (X, U). For given H, the set U can be split into set of tree edges from the forest G_H and the set of inverse edges that do not belong to this forest.
If we now make the assumption that q is a quadratic residue of all odd primes z not greater than 2m + 1, then it follows from earlier theorems (§37) that the prime q, since it is ≡ 1 (mod 8) and hence a quadratic residue of each power of 2, is also a quadratic residue of each number which has no odd prime factors except the prime numbers z
[…] perhaps the author himself, despite the hundred and fifty pages which he has filled, has been somewhat cramped by his attempt to be halieutically encyclopaedic.
