If I understand the question correctly then a is a proper subset of u.
Some decimals are. Counting numbers are a proper subset of decimals.
Counting numbers are a proper subset of whole numbers which are the same as integers which are a proper subset of rational numbers.
All counting numbers ARE (not is!) a proper subset of the set of whole numbers.
The set of counting numbers is a proper subset of the whole number. The latter includes negative counting numbers. Also, there is no consensus as to whether 0 belongs to counting numbers or whole numbers.
The set of counting numbers is the positive integers. The set of whole numbers is the positive integers plus zero. The term "natural numbers" has been used interchangeably with both of those sets.
Some decimals are. Counting numbers are a proper subset of decimals.
Counting numbers are a proper subset of whole numbers which are the same as integers which are a proper subset of rational numbers.
Yes, counting numbers are a proper subset of whole numbers.
They are not. Counting numbers are a proper subset of whole numbers. Negative integers (-1, -2, -3 etc) are whole numbers but they are not counting numbers.
All counting numbers ARE (not is!) a proper subset of the set of whole numbers.
The set of counting numbers is a proper subset of the whole number. The latter includes negative counting numbers. Also, there is no consensus as to whether 0 belongs to counting numbers or whole numbers.
The set of counting numbers is the positive integers. The set of whole numbers is the positive integers plus zero. The term "natural numbers" has been used interchangeably with both of those sets.
Yes.
A finite set is a set with a finite number of elements. An infinite set has an infinite number of elements. Intuitively, if you count the elements in a finite set, you will eventually finish counting; with an infinite set, you'll never finish counting. One characteristic of infinite sets is that they can be placed in one-to-one correspondence with proper subsets of the set. For example, if A = {1, 2, 3, 4, ...} (the counting numbers), and B = {2, 3, 4, 5, ...} (the counting numbers, starting at 2), then B is a proper subset of A, and they can be placed in one-to-one correspondence like this: 1 <---> 2; 2 <---> 3; 3 <---> 4, etc. This means that, in a certain sense, the set and its proper subset have "the same number of elements". Such a one-to-one correspondence (between a set and one of its proper subsets) is not possible with finite sets.
Complex numbers are a proper superset of real numbers. That is to say, real numbers are a proper subset of complex numbers.
The testes are contained in the scrotum, which is an external sac located outside the body. This position helps regulate the temperature of the testes for proper sperm production.
12 years counting from when puberty started.