Consider the function that assigns each positive integer to its FIRST (leading) digit. (For example, the positive integer 517 gets assigned to 5). In Blank 1: What is the domain of this function? In Blank 2: What is the range of this function? (note I am not asking for the co- domain here) Please use either the roster method or set-builder notation for your response. In Blank 3: Is this function injective? (yes or no) Blank # 1 Blank # 2 Blank # 3

Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
Section: Chapter Questions
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Consider the function that assigns each positive integerto its FIRST (leading) digit.
(For example, the positive integer 517 gets assigned to 5).
In Blank 1: VWhat is the domain of this function?
In Blank 2: What is the range of this function? (note I am not asking for the co-
domain here) Please use either the roster method or set-builder notation for your
response.
In Blank 3: Is this function injective? (yes or no)
Blank # 1
Blank # 2
Blank # 3
Transcribed Image Text:Consider the function that assigns each positive integerto its FIRST (leading) digit. (For example, the positive integer 517 gets assigned to 5). In Blank 1: VWhat is the domain of this function? In Blank 2: What is the range of this function? (note I am not asking for the co- domain here) Please use either the roster method or set-builder notation for your response. In Blank 3: Is this function injective? (yes or no) Blank # 1 Blank # 2 Blank # 3
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