more honest reporting of analytic Sha status for ECQ

JohnCremona · Mar 7, 2024 · 2b47fe1 · 2b47fe1
1 parent 53f364d
commit 2b47fe1
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Showing 2 changed files with 4 additions and 3 deletions.
diff --git a/lmfdb/elliptic_curves/templates/ec-curve.html b/lmfdb/elliptic_curves/templates/ec-curve.html
@@ -271,10 +271,10 @@ <h2> {{ KNOWL('ec.q.bsdconjecture', title='BSD invariants') }}</h2>
         	  {% if data.mwbsd.sha > 1 %}
           	  = {{data.mwbsd.sha2}}
             {% endif %}
-            {% if data.rank > 1 %}
-              ({{ KNOWL('ec.q.analytic_sha_value',title="rounded") }})
-            {% else %}
+            {% if data.mwbsd.sha_is_exact %}
               ({{ KNOWL('ec.q.analytic_sha_value',title="exact") }})
+            {% else %}
+              ({{ KNOWL('ec.q.analytic_sha_value',title="rounded") }})
             {% endif %}
           {% endif %}
         </td>

diff --git a/lmfdb/elliptic_curves/web_ec.py b/lmfdb/elliptic_curves/web_ec.py
@@ -620,6 +620,7 @@ def make_mwbsd(self):
             mwbsd['reg']  = self.regulator
             mwbsd['sha']  = self.sha
             mwbsd['sha2'] = latex_sha(self.sha)
+            mwbsd['sha_is_exact'] = self.rank==0 and self.conductor<500000
             for num in ['reg', 'special_value', 'real_period', 'area']:
                 mwbsd[num]  = RR(mwbsd[num])
         except AttributeError: