Direct product and direct sum of group and Euler phi function

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Direct product and direct sum of group and Euler phi function

0:00 start and future outline
3:00 main theorem prove
19:00 prove Z_{mn}=Z_{m} times Z_{n}
22:00 Euler phi function and show it is multiplicative

Advanced mathematics list:

Group representation for finite group

exact sequences

Ring theory lecture

group theory lecture

Category theory

Field theory in abstract algebra

Mathematical analysis

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  1. Math Geeks
  2. Direct product and direct sum of group
  3. direct sum of group
  4. phi function number theory
  5. phi function is multiplicative
  6. phi function gaussian
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