Prove that: (a) If A is an nxn Hadamard matrix, then n=1 or n = 2 or n is divisible by 4. (Previous midterm question?) (b) There exists an nxn. Hadamard matrix for 2 of 2. (Gaze at the block for advice...). leach in which is a power structure of the 4x4 example An open conjecture is that nxn Hadamard matrices exist. whenever n is divisible by 4. (Hadamard himself displayed. 12x 12 and 20x20 examples.) The smallest integer divisible by 4 for which no Hadamard matrix is known currently is 668.

Linear Algebra: A Modern Introduction
4th Edition
ISBN:9781285463247
Author:David Poole
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Chapter7: Distance And Approximation
Section7.1: Inner Product Spaces
Problem 16AEXP
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Prove that : (a) It' A is an nxn Hadamard matrix, then
n=l or n=2 or n is divisible by 4. (Previous midterm question? )
(b) There exists an nxo lHadamard matrix tore
2!of 2.( caze at the block
leach n which is a power
structure of the 4x4
example tor advice.. )
An
open conjecture is that nxn Hadamard matrices exist
whenever n 1s divisible by 4. (Hadamard himself displayed
12× 12 and 20x20 examples. ) The smallest.integer divisible by 4
for which no Hadamard matrix is known
currently.
is 668.
Transcribed Image Text:Prove that : (a) It' A is an nxn Hadamard matrix, then n=l or n=2 or n is divisible by 4. (Previous midterm question? ) (b) There exists an nxo lHadamard matrix tore 2!of 2.( caze at the block leach n which is a power structure of the 4x4 example tor advice.. ) An open conjecture is that nxn Hadamard matrices exist whenever n 1s divisible by 4. (Hadamard himself displayed 12× 12 and 20x20 examples. ) The smallest.integer divisible by 4 for which no Hadamard matrix is known currently. is 668.
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