--- a/core/src/luan/impl/$Luan.java	Wed Mar 30 22:42:27 2016 -0600
+++ b/core/src/luan/impl/$Luan.java	Thu Mar 31 22:43:51 2016 -0600
@@ -1,5 +1,6 @@
 package luan.impl;
 
+import java.util.Arrays;
 import java.util.List;
 import java.util.ArrayList;
 import luan.Luan;
@@ -58,8 +59,120 @@
 		throw new LuanException("attempt to perform arithmetic on a "+Luan.type(o)+" value");
 	}
 
-	public static Boolean not(Object o) throws LuanException {
+	public static boolean not(Object o) throws LuanException {
 		return !Luan.checkBoolean(o);
 	}
 
+	private static Object arithmetic(LuanState luan,String op,Object o1,Object o2) throws LuanException {
+		LuanFunction fn = Luan.getBinHandler(op,o1,o2);
+		if( fn != null )
+			return Luan.first(fn.call(luan,new Object[]{o1,o2}));
+		String type = !(o1 instanceof Number) ? Luan.type(o1) : Luan.type(o2);
+		throw new LuanException("attempt to perform arithmetic on a "+type+" value");
+	}
+
+	public static Object pow(LuanState luan,Object o1,Object o2) throws LuanException {
+		if( o1 instanceof Number && o2 instanceof Number )
+			return Math.pow( ((Number)o1).doubleValue(), ((Number)o2).doubleValue() );
+		return arithmetic(luan,"__pow",o1,o2);
+	}
+
+	public static Object mul(LuanState luan,Object o1,Object o2) throws LuanException {
+		if( o1 instanceof Number && o2 instanceof Number )
+			return ((Number)o1).doubleValue() * ((Number)o2).doubleValue();
+		return arithmetic(luan,"__mul",o1,o2);
+	}
+
+	public static Object div(LuanState luan,Object o1,Object o2) throws LuanException {
+		if( o1 instanceof Number && o2 instanceof Number )
+			return ((Number)o1).doubleValue() / ((Number)o2).doubleValue();
+		return arithmetic(luan,"__div",o1,o2);
+	}
+
+	public static Object mod(LuanState luan,Object o1,Object o2) throws LuanException {
+		if( o1 instanceof Number && o2 instanceof Number ) {
+			double d1 = ((Number)o1).doubleValue();
+			double d2 = ((Number)o2).doubleValue();
+			return d1 - Math.floor(d1/d2)*d2;
+		}
+		return arithmetic(luan,"__mod",o1,o2);
+	}
+
+	public static Object add(LuanState luan,Object o1,Object o2) throws LuanException {
+		if( o1 instanceof Number && o2 instanceof Number )
+			return ((Number)o1).doubleValue() + ((Number)o2).doubleValue();
+		return arithmetic(luan,"__add",o1,o2);
+	}
+
+	public static Object sub(LuanState luan,Object o1,Object o2) throws LuanException {
+		if( o1 instanceof Number && o2 instanceof Number )
+			return ((Number)o1).doubleValue() - ((Number)o2).doubleValue();
+		return arithmetic(luan,"__sub",o1,o2);
+	}
+
+	public static Object concat(LuanState luan,Object o1,Object o2) throws LuanException {
+		LuanFunction fn = Luan.getBinHandler("__concat",o1,o2);
+		if( fn != null )
+			return Luan.first(fn.call(luan,new Object[]{o1,o2}));
+		String s1 = luan.toString(o1);
+		String s2 = luan.toString(o2);
+		return s1 + s2;
+	}
+
+	public static boolean eq(LuanState luan,Object o1,Object o2) throws LuanException {
+		if( o1 == o2 || o1 != null && o1.equals(o2) )
+			return true;
+		if( o1 instanceof Number && o2 instanceof Number ) {
+			Number n1 = (Number)o1;
+			Number n2 = (Number)o2;
+			return n1.doubleValue() == n2.doubleValue();
+		}
+		if( o1 instanceof byte[] && o2 instanceof byte[] ) {
+			byte[] b1 = (byte[])o1;
+			byte[] b2 = (byte[])o2;
+			return Arrays.equals(b1,b2);
+		}
+		if( !(o1 instanceof LuanTable && o2 instanceof LuanTable) )
+			return false;
+		LuanTable t1 = (LuanTable)o1;
+		LuanTable t2 = (LuanTable)o2;
+		LuanTable mt1 = t1.getMetatable();
+		LuanTable mt2 = t2.getMetatable();
+		if( mt1==null || mt2==null )
+			return false;
+		Object f = mt1.rawGet("__eq");
+		if( f == null || !f.equals(mt2.rawGet("__eq")) )
+			return false;
+		LuanFunction fn = Luan.checkFunction(f);
+		return Luan.checkBoolean( Luan.first(fn.call(luan,new Object[]{o1,o2})) );
+	}
+
+	public static boolean le(LuanState luan,Object o1,Object o2) throws LuanException {
+		if( o1 instanceof Number && o2 instanceof Number ) {
+			Number n1 = (Number)o1;
+			Number n2 = (Number)o2;
+			return n1.doubleValue() <= n2.doubleValue();
+		}
+		if( o1 instanceof String && o2 instanceof String ) {
+			String s1 = (String)o1;
+			String s2 = (String)o2;
+			return s1.compareTo(s2) <= 0;
+		}
+		LuanFunction fn = Luan.getBinHandler("__le",o1,o2);
+		if( fn != null )
+			return Luan.checkBoolean( Luan.first(fn.call(luan,new Object[]{o1,o2})) );
+		fn = Luan.getBinHandler("__lt",o1,o2);
+		if( fn != null )
+			return !Luan.checkBoolean( Luan.first(fn.call(luan,new Object[]{o2,o1})) );
+		throw new LuanException( "attempt to compare " + Luan.type(o1) + " with " + Luan.type(o2) );
+	}
+
+	public static boolean lt(LuanState luan,Object o1,Object o2) throws LuanException {
+		return Luan.isLessThan(luan,o1,o2);
+	}
+
+	public static boolean cnd(Object o) throws LuanException {
+		return !(o == null || Boolean.FALSE.equals(o));
+	}
+
 }