Is every natural number positive?
Natural numbers, also called counting numbers, are numbers you would normally count with. A good rule of thumb is that if you could count it on your fingers it's a natural number (double digits, triple digits are included too though). Negative numbers CANNOT be considered natural numbers.
It depends on if you consider 0 a natural number. If it is then every natural number is non-negative.
It depends on whether or not
Natural numbers are always non-negative and whole, but sometimes
One way of thinking of it is as follows:
A cardinal number is a number that counts the number of items in a set. Since it counts items, it is whole and cannot be negative, but the empty set is a set containing
An ordinal number tells you the order in which items occur. Ordinal names are "first", "second", "third", etc., corresponding to numbers
Natural "counting" numbers could refer to a cardinal or ordinal type of usage. So there are good reasons for starting from
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