diff --git a/README.md b/README.md
index 740009e..5d239b7 100644
--- a/README.md
+++ b/README.md
@@ -4,9 +4,9 @@ Scripts and library for develop macros and extensions for LibreOffice with Pytho
 
 Develop in pure Python, not need any dependence.
 
-Python 3.7+
-LibreOffice 7.0+
-LibreOffice SDK 7.0+
+* Python 3.7+
+* LibreOffice 7.0+
+* LibreOffice SDK 7.0+
 
 * Look [documentation](https://doc.cuates.net/zaz/)
 
diff --git a/source/easymacro.py b/source/easymacro.py
index 2d1c4f4..1b848a1 100644
--- a/source/easymacro.py
+++ b/source/easymacro.py
@@ -83,7 +83,6 @@ from com.sun.star.table.CellContentType import EMPTY, VALUE, TEXT, FORMULA
 from com.sun.star.util import Time, Date, DateTime
 
 from com.sun.star.text.ControlCharacter import PARAGRAPH_BREAK
-from com.sun.star.text.TextContentAnchorType import AS_CHARACTER
 
 from com.sun.star.lang import Locale
 from com.sun.star.lang import XEventListener
@@ -230,6 +229,12 @@ class FormButtonType():
 FBT = FormButtonType
 
 
+class TextContentAnchorType():
+    from com.sun.star.text.TextContentAnchorType \
+        import AT_PARAGRAPH, AS_CHARACTER, AT_PAGE, AT_FRAME, AT_CHARACTER
+TCAT = TextContentAnchorType
+
+
 OS = platform.system()
 IS_WIN = OS == 'Windows'
 IS_MAC = OS == 'Darwin'
@@ -3302,6 +3307,19 @@ class LOWriterTextRange(object):
         self.text.insertTextContent(cursor, data, replace)
         return
 
+    def insert_math(self, formula,
+            anchor_type=TextContentAnchorType.AS_CHARACTER,
+            cursor=None, replace=False):
+        CLSID = '078B7ABA-54FC-457F-8551-6147e776a997'
+        service = 'com.sun.star.text.TextEmbeddedObject'
+
+        math = self._doc.create_instance(service)
+        math.CLSID = CLSID
+        math.AnchorType = anchor_type
+        self.insert_content(math, cursor, replace)
+        math.EmbeddedObject.Component.Formula = formula
+        return math
+
     def new_line(self, count=1):
         cursor = self.cursor
         for i in range(count):
@@ -3324,7 +3342,7 @@ class LOWriterTextRange(object):
         h = args.get('Height', 1000)
         image = self._doc.create_instance('com.sun.star.text.GraphicObject')
         image.GraphicURL = _P.to_url(path)
-        image.AnchorType = AS_CHARACTER
+        image.AnchorType = TextContentAnchorType.AS_CHARACTER
         image.Width = w
         image.Height = h
         self.insert_content(image)