Consider a soldier facing in a given direction (say north). Let us denote "left face" by ℓ, "right face" by r, "about face" by a, and "stand fast" by f. (The element f means "don't move from your present position." It does not mean "return to your original position.") Then we define H = {ℓ, r, a, f} and an operation  meaning "followed by." Thus, ℓ  ℓ = a means "left face" followed by "left face" and is the same as the single command "about face." Complete the following table.          ℓ r a f ℓ a       r         a         f

Computer Networking: A Top-Down Approach (7th Edition)
7th Edition
ISBN:9780133594140
Author:James Kurose, Keith Ross
Publisher:James Kurose, Keith Ross
Chapter1: Computer Networks And The Internet
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Problem R1RQ: What is the difference between a host and an end system? List several different types of end...
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Consider a soldier facing in a given direction (say north). Let us denote

"left face" by ℓ,
"right face" by r,
"about face" by a, and
"stand fast" by f.

(The element f means "don't move from your present position." It does not mean "return to your original position.") Then we define

H = {ℓ, r, a, f}

and an operation  meaning "followed by." Thus, ℓ  ℓ = a means "left face" followed by "left face" and is the same as the single command "about face." Complete the following table.

         r a f
a      
r        
a        
f        

 

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