Zero
In the Middle Ages, the concept of zero was heavily in European use. 0 - proclaimed almost the number of the devil, because the mind of the then Europeans simply could not understand the idea of emptiness.
Now for us this series is normal:
-5, -4, -3, -2, -1, 0, 1, 2, 3, 4, 5
')
But the Egyptians thought so:
1/5, 1/4, 1/3, 1/2, 1, 2, 3, 4, 5
In writing, everything was fine without zero. And the Egyptians and Europeans:
In the end, in the VIII. The Arabic mathematician Al-Khorezmi brought zero to the Islamic world, and 400 years later he marched to Europe through Arab settlements in Spain. The local traders cheerfully accepted the new system, since it allowed them to calculate the profits at an unprecedented rate. Well, after some time, religious leaders had to rethink their approach to zero.
Now for us this series is normal:
-5, -4, -3, -2, -1, 0, 1, 2, 3, 4, 5
')
But the Egyptians thought so:
1/5, 1/4, 1/3, 1/2, 1, 2, 3, 4, 5
In writing, everything was fine without zero. And the Egyptians and Europeans:
In the end, in the VIII. The Arabic mathematician Al-Khorezmi brought zero to the Islamic world, and 400 years later he marched to Europe through Arab settlements in Spain. The local traders cheerfully accepted the new system, since it allowed them to calculate the profits at an unprecedented rate. Well, after some time, religious leaders had to rethink their approach to zero.
Source: https://habr.com/ru/post/58199/
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