1. The induced net minus energy of a closed universe equals the density rate of the second time change multiplying a constant.

2. In a closed universe, there is enough matter to reverse expansion. Eventually, such a universe will collapse on itself.

3. Note that in a closed universe you could start a journey off in one direction and, if allowed enough time, ultimately return to your starting point; in an infinite universe, you would never return.

4. A closed universe is a finite universe -- it will only expand to a certain size before collapsing.

5. Trading involves only a handful of traders who make the markets and a relatively closed universe of institutional investors.

6. If the universe has a positive curvature, it's a closed universe.

7. An united approach of the large scale structure of a closed universe and local spherically symmetric gravitation field is given by supposing an appropriate boundary condition.