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Introduction and history of multiset development
A multiset mset is an unordered collection allowing repetitions
A natural number NAT is an mset of zeroes
A polynumber is an mset of natural numbers
A multinumber is an mset of polynumbers
Addition of msets
NAT is closed under addition and commutative, associative
Multinumbers are also closed under addition
Multiplication of msets of msets
Each "type domain" is closed under addition and multiplication
The meaning of "poly"
Distinction of mset and list
Mathematics as a topic in computer science
Insights into Mathematics
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