I agree with the first post.
The universe is not defined and therefore finite.
Not every single idea, or concept can be infinite.
Finite-Boundry theory (A theory I have hypothesized)
For example, of computer programing an integer can only reach up to 4294967295. Which is exactly 32 bits (I might be wrong).
The numeric system is often thought of as infinite, but is undefinable. Bob can't count every single number of the whole numeric system. The ends, limits, and boundaries are unknown.
Can we say for certain that the numeric system is infinite? No, the limitations are unknown (There could be a number that can be found using your calculator but that does not mean it exists in the real world).
Can we say that the numeric system is PROBABLY infinite? Yes, if all that is being done is bashing on your calculator.