| 21. | A right Artinian and two-sided injective,.
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| 22. | Because a representation is determined by its character, \ chi is injective.
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| 23. | A full and faithful functor is necessarily injective on objects up to isomorphism.
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| 24. | In particular, if is a field then the Frobenius endomorphism is injective.
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| 25. | A closed immersion is radicial ( universally injective ).
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| 26. | Often it is assumed that \ sigma is injective.
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| 27. | This avoids the " almost-injective " argument.
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| 28. | It is, by elementary group theory, injective.
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| 29. | :: : The sine function is not injective.
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| 30. | It also follows from this construction that " i " is injective.
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