Theorem on Surjectivity, Injectivity and Composition

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Theorem on Surjectivity, Injectivity and Composition
-0:00 What the theorem says
-0:42 Proof of (a)
-3:19 Proof of (b)
-6:11 Proof of (c)
-8:55 Proof of (d)

-11:16 Corollary of the theorem

Preliminary material:
  1. JF Sherazi
  2. Surjectivity
  3. Injectivity
  4. Surjective
  5. Injective
  6. Surjection
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