deletions | additions       diff --git a/layout.md b/layout.md  index ee46fa3..6ba8ab2 100644  --- a/layout.md  +++ b/layout.md 
...
Theorem_3_follows_from_1__.tex  Delta_Subsituting_vec_v_t__.tex  Now_let_s_derive_x__.tex  Now_looking_at_1_again__.tex