diff --git a/newrpl/lib-104-solvers.c b/newrpl/lib-104-solvers.c
index c254a47..2a2d267 100644
--- a/newrpl/lib-104-solvers.c
+++ b/newrpl/lib-104-solvers.c
@@ -26,7 +26,8 @@
         ERR(INVALIDLISTOFVARS,2), \
         ERR(INVALIDVARRANGE,3), \
         ERR(REALVALUEDFUNCTIONSONLY,4), \
-        ERR(TRYDIFFERENTRANGE,5)
+        ERR(TRYDIFFERENTRANGE,5), \
+        ERR(INVALIDSYMBFUNCTION,6)
 
 // LIST OF COMMANDS EXPORTED,
 // INCLUDING INFORMATION FOR SYMBOLIC COMPILER
@@ -151,6 +152,41 @@ case NUMINT:
             return;
         }
 
+        // ADD CHECKS TO SEE IF THE SYMBOLIC IS VALID
+        if(ISSYMBOLIC(*rplPeekData(4))) {
+            if(rplSymbMainOperator(rplPeekData(4))!=CMD_EQUATIONOPERATOR) {
+                rplError(ERR_INVALIDSYMBFUNCTION);
+                return;
+            }
+            WORDPTR leftpart=rplSymbMainOperatorPTR(rplPeekData(4))+1;
+            if(ISSYMBOLIC(*leftpart)) {
+                if(rplSymbMainOperator(leftpart)!=CMD_OVR_FUNCEVAL) {
+                    rplError(ERR_INVALIDSYMBFUNCTION);
+                    return;
+                }
+                // COUNT NUMBER OF ARGUMENTS
+                WORDPTR end=rplSkipOb(leftpart);
+                BINT nargs=0;
+                leftpart=rplSymbMainOperatorPTR(leftpart)+1;
+                while(leftpart<end) { ++nargs; leftpart=rplSkipOb(leftpart); }
+                if(nargs!=2) {
+                    rplError(ERR_INVALIDSYMBFUNCTION);
+                    return;
+                }
+            }
+            else {
+                rplError(ERR_INVALIDSYMBFUNCTION);
+                return;
+
+            }
+
+
+
+        }
+
+
+
+
         if(!ISNUMBERCPLX(*rplPeekData(3)) || !ISNUMBERCPLX(*rplPeekData(2)))
         {
             rplError(ERR_COMPLEXORREALEXPECTED);
diff --git a/newrpl/rpl-objects/lib-104.nrpl b/newrpl/rpl-objects/lib-104.nrpl
index 38135b5..22172e3 100644
--- a/newrpl/rpl-objects/lib-104.nrpl
+++ b/newrpl/rpl-objects/lib-104.nrpl
@@ -23,6 +23,7 @@
 ##1,ERR_INVALIDVARRANGE "Invalid variable range"
 ##1,ERR_REALVALUEDFUNCTIONSONLY "Real valued func only"
 ##1,ERR_TRYDIFFERENTRANGE "Try a different range"
+##1,ERR_INVALIDSYMBFUNCTION "Use 'f(x)=...' in expressions."
 }
 
 @#name lib104_menu
diff --git a/newrpl/rpl-objects/lib-56.nrpl b/newrpl/rpl-objects/lib-56.nrpl
index 07c8b43..35bff28 100644
--- a/newrpl/rpl-objects/lib-56.nrpl
+++ b/newrpl/rpl-objects/lib-56.nrpl
@@ -202,7 +202,7 @@ R → A<fraction>"
 @#name allroots_rules
 {
 '√.xX:→XROOT(ABS(.xX),2)*c{1,-1}'
-'.xX^(1/.iN):→XROOT(ABS(.xX),.iN)*е^(ARG(.xX)/.iN*і+∡360°/.iN*RANGE(1,.iN,1))'
+'.xX^(1/.iN):→XROOT(ABS(.xX),.iN)*е^(і*(ARG(.xX)/.iN+∡360°/.iN*RANGE(1,.iN,1)))'
 }