diff --git a/lua/typstar/snippets/math.lua b/lua/typstar/snippets/math.lua
index 2e2a7f7..2d609d8 100644
--- a/lua/typstar/snippets/math.lua
+++ b/lua/typstar/snippets/math.lua
@@ -20,6 +20,8 @@ return {
 
     -- boolean logic
     snip('no', 'not ', {}, math),
+    snip('ip', '==>> ', {}, math),
+    snip('ib', '<<== ', {}, math),
     snip('iff', '<<=>> ', {}, math),
 
     -- relations
@@ -42,7 +44,8 @@ return {
     snip('bxx', 'times.square ', {}, math),
 
     -- sets
-    snip('set', '{<>}', { i(1) }, math),
+    -- 'st' to '{<>} in ./visual.lua
+    snip('set', '{<>|<>}', { i(1), i(2) }, math),
     snip('es', 'emptyset ', {}, math),
     snip('ses', '{emptyset} ', {}, math),
     snip('sp', 'supset ', {}, math),
@@ -70,10 +73,15 @@ return {
     snip('(.*)kk', '<>^(<>)', { cap(1), i(1, 'n') }, math),
 
     snip('ddx', '(d <>)(d <>)', { i(1, 'f'), i(2, 'x') }, math),
-    snip('it', 'integral_(<>)^(<>)', { i(1, 'a'), i(2, 'b') }, math),
-    snip('oit', 'integral_(Omega}', {}, math),
-    snip('dit', 'integral_{<>}', { i(1, 'Omega') }, math),
-    snip('sm', 'sum_(<>)^(<>)', { i(1, 'i=0'), i(2, 'oo') }, math),
+    snip('it', 'integral', {}, math),
+    snip('int', 'integral_(<>)^(<>)', { i(1, 'a'), i(2, 'b') }, math),
+    snip('oit', 'integral_Omega', {}, math),
+    snip('dit', 'integral_(<>)', { i(1, 'Omega') }, math),
+
+    snip('sm', 'sum ', {}, math),
+    snip('sum', 'sum_(<>)^(<>)', { i(1, 'i=0'), i(2, 'oo') }, math),
+    snip('osm', 'sum_Omega', {}, math),
+    snip('dsm', 'sum_(<>)', { i(1, 'I') }, math),
 
     snip('lm', 'lim <>', { i(1, 'a_n') }, math),
     snip('lim', 'lim_(<> ->> <>) <>', { i(1, 'n'), i(2, 'oo'), i(3, 'a_n') }, math),
diff --git a/lua/typstar/snippets/visual.lua b/lua/typstar/snippets/visual.lua
index b588189..9e36a08 100644
--- a/lua/typstar/snippets/visual.lua
+++ b/lua/typstar/snippets/visual.lua
@@ -11,10 +11,12 @@ local math = helper.in_math
 local snip = helper.snip
 
 local snippets = {}
+
 local operations = { -- first boolean: existing brackets should be kept; second boolean: brackets should be added
     { 'vi', '1/', '', true, false },
     { 'bb', '(', ')', true, false }, -- add round brackets
     { 'sq', '[', ']', true, false }, -- add square brackets
+    { 'st', '{', '}', true, false }, -- add curly brackets 
     { 'bB', '(', ')', false, false }, -- replace with round brackets
     { 'sQ', '[', ']', false, false }, -- replace with square brackets
     { 'BB', '', '', false, false }, -- remove brackets