Here is a set of 5 photographs: click on them to enlarge.
Desert has encroached almost up to the edge of the river here. A microwave radio communications tower is visible in the background.
Another view of the East bank of Nile.
This month’s topic: Arithmetic of remainders (continued).
Some more advanced theorems with proofs are shown in Plates 1 to 4 below.
Plate 1: Theorem 7
Plate 2: Theorem 8
Plate 3: Theorem 9