implement syntax: mathBlock

src/parser/core-parser.pegjs

@@ -24,7 +24,7 @@ block
 	/ quote
 	/ search
 	/ blockCode
-	// / mathBlock
+	/ mathBlock
 	/ center
 
 inline
@@ -114,6 +114,17 @@ blockCode_line
 	= !("```" ENDLINE) line:$(CHAR+) NEWLINE { return line; }
 
 
+// block: mathBlock
+
+mathBlock
+	= BEGINLINE "\\[" content:$(!"\\]" c:. { return c; })+ "\\]" ENDLINE
+{
+	return createTree('mathBlock', {
+		formula: content.trim()
+	});
+}
+
+
 // block: center
 
 center