[scikit-learn] A math mistake in spectral_embedding

[gen tang]

Hi, everyone.

I am quite new to this mail list.

I think that I found a math mistake in spectral_embedding function. And I
created a issue in github

https://github.com/scikit-learn/scikit-learn/issues/8129

However, github can't show mathmatics equation, I send you pdf version(in
attachment) of bug description by mail.

Can anyone verify this math detail? Thanks a lot

Cheers
Gen
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