Bounded Above Subset of Real Numbers/Examples/Strictly Negative Real Numbers

Example of Bounded Above Subset of Real Numbers

Let $I$ be the unbounded open real interval defined as:

$I := \openint \gets 0$

Then $I$ is bounded above.

$0$ is an upper bound of $I$.

Sources

• 1975: W.A. Sutherland: Introduction to Metric and Topological Spaces ... (previous) ... (next): $1$: Review of some real analysis: $\S 1.1$: Real Numbers: Example $1.1.1 \ \text{(b)}$