RECIPROCITY

The wider the passageway to the antechamber of learning, the narrower the passageway from the antechamber to the hall.
Hence:
1. Euclid’s vain attempt to teach the king Geometry;
2. why learning mathematics is based on humility;
keywords: education, instruction, training, accessibility

Determination of Parity

Parity of an integer concerns whether the integer is even (or odd), and it is well to be aware of some parity-related results, for example, the fact that the sum of any two odd numbers is even.
keywords: division by 2, dividing by 2, evenness, oddness, Mathematics, Number Theory

lorem ipsum

It’s commonplace for an EL to get mugged by a pair of homonyms (their/there; waste, waist; etc.).
keywords: education, instruction, training, ESL, language barrier