diff --git a/constants.py b/constants.py
index e0c710d..a51636b 100644
--- a/constants.py
+++ b/constants.py
@@ -20,3 +20,14 @@ DEPRECATED = {
     r'\sm': r'\setminus',
     r'\st': r'^{\ast}',
 }
+
+UNICODE = {
+    '∃': r'\exists',
+    '∀': r'\forall',
+    'ℕ': r'\mathbb{N}',
+    'ℤ': r'\mathbb{Z}',
+    'Λ': r'\Lambda',
+    '⇔': r'\iff',
+    '⇒': r'\implies',
+    '⇐': r'\impliedby'
+}
diff --git a/latex_legacy_converter.py b/latex_legacy_converter.py
index 8a57dfd..34c0e50 100644
--- a/latex_legacy_converter.py
+++ b/latex_legacy_converter.py
@@ -1,4 +1,4 @@
-from constants import ENVIRONMENTS, ALPHABETS, DEPRECATED
+from constants import *
 import re
 from pathlib import Path
 
@@ -28,6 +28,8 @@ def migrate_lazy_math_alphabets(line: str) -> str:
 
 
 def migrate_deprecated(line: str) -> str:
+    if '∃' in line:
+        foo = 2
     for old, new in DEPRECATED.items():
         while True:
             old = old.replace('\\', r'\\')
@@ -39,6 +41,12 @@ def migrate_deprecated(line: str) -> str:
     return line
 
 
+def replace_unicode(line: str) -> str:
+    for old, new in UNICODE.items():
+        line = line.replace(old, r'\ensuremath{%s}' % new)
+    return line
+
+
 def migrate_environments(line: str) -> str:
     for old_env, new_env in ENVIRONMENTS.items():
         line = line.replace(r'\begin{%s}' % old_env, r'\begin{%s}' % new_env)
@@ -50,6 +58,7 @@ def optimize_line(line: str) -> str:
     line = migrate_environments(line)
     line = migrate_lazy_math_alphabets(line)
     line = migrate_deprecated(line)
+    line = replace_unicode(line)
     return line