Numbers, Forbidden and Superstitious
In trying to understand the world, mankind has created many superstitions and myths that have slowly led to what we consider modern science. For example, alchemy, the attempt to change other materials into gold, helped establish important principles of modern chemistry. The same is true of mathematics.
Many mathematical theories have been proposed over the centuries. Some have become the foundation of major branches of mathematics. Others have been disproved and discarded. But like many other superstitions, some erroneous theories have unfortunately persisted even after the science of mathematics has examined and invalidated them.
The Number 13
Thirteen frequently is called an unlucky number. Many modern buildings, particularly hotels, will not have a floor numbered as the thirteenth floor because so many people consider it unlucky and wish to avoid it. Of course, any building of sufficient height does have a thirteenth floor; it is simply skipped in the numbering of floors, which will go from 12 directly to 14. But this is enough either to satisfy or to delude most superstitious people. Many airlines will skip numbering across the thirteenth row.
Similarly, some race car drivers reject the number 13 to identify their cars, and some street numbers are altered to avoid the use of the number 13.
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