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Seewoo Lee
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Is there a proof of quadratic reciprocity using $p$-adic numbers?

I asked same question on MSE before, but I didn't get any answer yet.


I know that the quadratic reciprocity can be regarded as a special case of Artin reciprocity (class field theory), and we can get it by considering the cyclotomic extension of $\mathbb{Q}_{p}$. However, I want to know if there's any proof of quadratic reciprocity that doesn't use any stronger result, but only uses some properties of $p$-adic numbers. Thanks in advance.

More precisely, we can do analysis on $\mathbb{Q}_{p}$. We have an exponential and logarithm function on $\mathbb{Q}_{p}$ (at least for $p>2$), and we understand unit group $\mathbb{Z}_{p}^{\times}$ well, etc. But I don't know how to prove it in a purely local and analytic way.

Seewoo Lee
  • 2.2k
  • 12
  • 16