Counting Method / June 6, 2018 / Victoria Muller
Like the natural numbers, Z is closed under the operations of addition and multiplication, that is, the sum and product of any two integers is an integer. However, with the inclusion of the negative natural numbers, and, importantly, 0, Z (unlike the natural numbers) is also closed under subtraction. The integers form a unital ring which is the most basic one, in the following sense: for any unital ring, there is a unique ring homomorphism from the integers into this ring. This universal property, namely to be an initial object in the category of rings, characterizes the ring Z.
Cons of the potty practice method. Sticking to the structure and schedule until the toddler is potty trained. Could take anywhere from a weekend to a few months depending on the child's maturity level, temperament and readiness. May not learn to initiate himherself, because parent always initiates. Keeping the curios toddler interested long enough to sit on the potty and relax, so she is able to eliminate.