Yes, pi is considered an abstract number.
According to the reference, pi represents the limit of the relationship between a circle's circumference and its diameter. Because physical circles are imperfect, pi is abstract, rather than physical. The reference clarifies that there is no actual number that perfectly measures the relationship in any given specific physical circle.
| Aspect | Pi | Physical Circle |
|---|---|---|
| Nature | Abstract | Physical |
| Perfection | Represents a perfect relationship | Always imperfect due to physical limitations |
| Measurement | A definite, fixed number | Measurement subject to error |
| Representation | A theoretical limit | A tangible object |
Therefore, because pi is a theoretical concept representing a perfect relationship that cannot be fully realized in the physical world, it is accurately described as an abstract number.
