) Find a bijection between A and some set B of shortest paths that you think you can count. Justify that your function is a bijection. O Find |B|.

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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1. Let k E N. Let A be the set of all 2k-tuples (a1, ..., a2k) such that
• ɑ; = 0 for k values of i,
• ai = 1 for k values of i, and
• for each i,
Laj >
j=1
(a) Find a bijection between A and some set B of shortest paths that
you think you can count. Justify that your function is a bijection.
(b) Find |B|.
Transcribed Image Text:1. Let k E N. Let A be the set of all 2k-tuples (a1, ..., a2k) such that • ɑ; = 0 for k values of i, • ai = 1 for k values of i, and • for each i, Laj > j=1 (a) Find a bijection between A and some set B of shortest paths that you think you can count. Justify that your function is a bijection. (b) Find |B|.
Expert Solution
Step 1

a.

 f(ai)=i     ,i=0,1,2,...(2k-1)B={0,2,...,2k-1}

Every point of B has a unique pre-image in A.So, f is surjective and for all ij,aiaj, so f is injective. Thus f is biective.

 

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