- http://experiment.worldcat.org/entity/work/data/9356374#Topic/infinite
- http://id.loc.gov/authorities/subjects/sh85066098
- http://experiment.worldcat.org/entity/work/data/9356374#Topic/philosophy_metaphysics
- http://experiment.worldcat.org/entity/work/data/9356374#Topic/unendlichkeit
- http://experiment.worldcat.org/entity/work/data/9356374#Topic/mathematik
- http://id.worldcat.org/fast/972421
- http://experiment.worldcat.org/entity/work/data/9356374#Topic/philosophie
- http://experiment.worldcat.org/entity/work/data/9356374#Topic/geschichte

- "Space is big. Really big. You just won't believe how vastly, hugely, mind-bogglingly big it is. I mean, you may think it's a long way down the street to the chemist, but that's just peanuts to space.' Douglas Adams, Hitch-hiker's Guide to the Galaxy We human beings have trouble with infinity - yet infinity is a surprisingly human subject. Philosophers and mathematicians have gone mad contemplating its nature and complexity - yet it is a concept routinely used by schoolchildren. Exploring the infinite is a journey into paradox. Here is a quantity that turns arithmetic on its head."@en