[spec] minor clarifications to calculus section of sac notes

diff --git a/physics/fields.log b/physics/fields.log
index 955d19b31126b65ca83c91992b8e64da9c1002b6..10dfa9d6d9d7fe1c623bac2b35913e488806e7b4 100644 (file)
--- a/physics/fields.log
+++ b/physics/fields.log
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