- KEID (Omicron-2 Eridani, or 40 Eridani). An unassuming star, Keid (Omicron-2) of Eridanus (and more commonly known by its Flamsteed number, 40 Eridani) seems to play second fiddle to its somewhat brighter neighbor Beid, Keid the Arabic “egg shells” of Beid, “the eggs.”
- Arithmetic (Wikipedia)
Arithmetic (from Ancient Greek ἀριθμός (arithmós) ’number’, and τική [τέχνη] (tikḗ [tékhnē]) ‘art, craft’) is an elementary part of mathematics that consists of the study of the properties of the traditional operations on numbers—addition, subtraction, multiplication, division, exponentiation, and extraction of roots. In the 19th century, Italian mathematician Giuseppe Peano formalized arithmetic with his Peano axioms, which are highly important to the field of mathematical logic today.