0 FAQs:

Q: Is a 0 used as a placeholder in place value systems?

A: Yes.

Q: Is a 0 usually written as a circle or ellipse?

A: Yes.

Q: Is a 0 the lowest ordinal number?

A: Yes, and corresponding to the empty set viewed as a well-ordered set.

Q: Is a 0 neither positive nor negative and is usually displayed as the central number in a number line?

A: Yes.

Q: Is a 0 often used for dialling out of a company network or to a different city or region?

A: Yes, and 00 is used for dialling abroad.

Q: Is a 0 an identity element with respect to addition?

A: Yes.

Q: Is a 0 the smallest non-negative integer?

A: Yes.

Q: Is a 0 the integer immediately preceding 1?

A: Yes, Zero is an even number because it is divisible by 2 with no remainder.

Q: Is a 0 a natural number?

A: Yes, and then the only natural number not to be positive.

Q: Is a 0 used either exclusively?

A: Yes, or not at all, to avoid confusion altogether.

Q: Is a 0 the cardinality of the empty set: if one does not have any apples?

A: Yes, and then one has 0 apples.

Q: Is a 0 converted into the null pointer at compile time when it appears in a pointer context?

A: Yes, and so 0 is a standard way to refer to the null pointer in code.

Q: Is a 0 neither positive nor negative?

A: Yes.

Q: Is a 0 defined to be the empty set?

A: Yes.

Q: Is a 0 sometimes used to denote an initial object of a category?

A: Yes.

Q: Is a 0 given to one of the drivers of the team that the reigning champion won the title with?

A: Yes.

Q: Was a 0 identified before the idea of negative things?

A: Yes, or quantities less than zero, was accepted.

Q: Is a 0 undefined?

A: Yes, because 0 has no multiplicative inverse , a consequence of the previous rule.