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Loïc Teyssier
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On the wikipedia articleOn the wikipedia article about Hadamard Matrix it says that "The smallest order that cannot be constructed by a combination of Sylvester's and Paley's methods is $92$"

But it also says that a new Hadamard matrix of size $nm$ can be created using Hadamard matrices of sizes $n$ and $m$.

Why isn't $23$ ($92=2 \times 2 \times 23$) the smallest size which cannot be created this way?

On the wikipedia article about Hadamard Matrix it says that "The smallest order that cannot be constructed by a combination of Sylvester's and Paley's methods is $92$"

But it also says that a new Hadamard matrix of size $nm$ can be created using Hadamard matrices of sizes $n$ and $m$.

Why isn't $23$ ($92=2 \times 2 \times 23$) the smallest size which cannot be created this way?

On the wikipedia article about Hadamard Matrix it says that "The smallest order that cannot be constructed by a combination of Sylvester's and Paley's methods is $92$"

But it also says that a new Hadamard matrix of size $nm$ can be created using Hadamard matrices of sizes $n$ and $m$.

Why isn't $23$ ($92=2 \times 2 \times 23$) the smallest size which cannot be created this way?

added 7 characters in body; edited title
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Denis Serre
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About the Hadamard conjuctureconjecture

On the wikipedia article about Hadamard Matrix it says that "The smallest order that cannot be constructed by a combination of Sylvester's and Paley's methods is 92"$92$"

But it also says that a new Hadamard matrix of size n times m$nm$ can be created using Hadamard matrices of sizes n$n$ and m$m$.

Why isn't 23$23$ (92=2 times 2 times 23$92=2 \times 2 \times 23$) the smallest size which cannot be created this way?

About the Hadamard conjucture

On the wikipedia article about Hadamard Matrix it says that "The smallest order that cannot be constructed by a combination of Sylvester's and Paley's methods is 92"

But it also says that a new Hadamard matrix of size n times m can be created using Hadamard matrices of sizes n and m.

Why isn't 23 (92=2 times 2 times 23) the smallest size which cannot be created this way?

About the Hadamard conjecture

On the wikipedia article about Hadamard Matrix it says that "The smallest order that cannot be constructed by a combination of Sylvester's and Paley's methods is $92$"

But it also says that a new Hadamard matrix of size $nm$ can be created using Hadamard matrices of sizes $n$ and $m$.

Why isn't $23$ ($92=2 \times 2 \times 23$) the smallest size which cannot be created this way?

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