Informal Complete Metric Space and Fixed Point Theorems
The concept of informal vector space is introduced in this paper. In informal vector space, the additive inverse element does not necessarily exist. The reason is that an element in informal vector space which subtracts itself cannot be a zero element. An informal vector space can also be endowed wi...
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| Format: | Article |
| Language: | English |
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MDPI AG
2019-11-01
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| Series: | Axioms |
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| Online Access: | https://www.mdpi.com/2075-1680/8/4/126 |