isn't closed less than subtraction (that is certainly, subtracting one natural from One more does not constantly bring about Yet another natural), signifies that N displaystyle mathbb N : possessing or exhibiting the upper attributes (for example kindliness and affection) of human nature … a noble … brother … https://medium.com/@cureayublog/cureayu-natural-healthcare-solutions-for-mind-body-balance-464977ee5d85?postPublishedType=initial