Added proofs and response.

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+
+# Responses to specific questions and comments
+
+ 1. Our ZIP code is 14853.
+
+ 2. Here is the DOI for that reference: https://doi.org/10.7566/JPSJ.82.013601
+
+ 3. OP is "order parameter."
+
+ 4. u-reps are irreducible representations of the point group that include an
+    inversion of space. The u, like the g subscripts in our paper, is simply a
+    label and not an abbreviation as far as we know. It might be replaced by
+    "u representations."
+
+ 5. LBCO is the chemical compound lanthanum barium copper oxide.
+
+ 6. We prefer to retain "falsify" over "disprove" because of its connection
+    with the philosophy of science of falsifiability, but the meaning of the
+    sentence is not otherwise affected by the change.
+
+ 7. Unfortunately an alternative does not exist right now.
+
+ 8. The Pergamon Press operated out of Oxford, UK.
+
+ 9. By "check" do you mean the breve on the 'ĭ' at the end of their name? That
+    accent appears in author listing in the 3rd edition of that text.
+
+ Q. Here is all the information I have, taken from the copy of the article in my possession:
+
+  V. L. Ginzburg, "Some remarks on phase transitions of the second kind and the
+  microscopic theory of ferroelectric materials," Soviet Physics: Solid State,
+  Vol. 2, No. 9, pp. 1824--1834 (1961). Translated from Fizika Tverdogo Tela,
+  Vol. 2, No. 9, pp. 2031--2043 (September 1960).
+
+
+# Other corrections
+
+The incorrect "it" on line 409 should have been replaced with "in," so that the
+line instead reads "Upon substitution of (A3) and expansion to quadratic order
+in <η(x)>, we find"
+
+Everything else appears to be correct.
+
diff --git a/proofs/BN13654.pdf b/proofs/BN13654.pdf
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