WIP #919 use #isZero() instead of isZERO()

Author: axkr

symja_android_library/matheclipse-core/src/main/java/org/matheclipse/core/polynomials/longexponent/ExprPolynomial.java

@@ -115,7 +115,7 @@ public ExprPolynomial(ExprPolynomialRing r) {
    */
   public ExprPolynomial(ExprPolynomialRing r, IExpr c, ExpVectorLong e) {
     this(r);
-    if (!c.isZERO()) {
+    if (!c.isZero()) {
       val.put(e, c);
     }
   }

symja_android_library/matheclipse-core/src/test/java/org/matheclipse/core/system/SolveTest.java

@@ -2032,13 +2032,38 @@ public void testIssue914() {
   // + "5243338316756303634461458718861951455543))/Log(7)}}");
   // }
 
+  // @Test
+  // public void testIssue918() {
+  // check("Solve({9==x/y, x==pi*y^4},{x,y})", //
+  // "{{y->-(-243/2*Pi^2+Sqrt(59049*Pi^4)/2)^(1/3)/(3*Pi),x->(-3*(1/2*(-243*Pi^2+Sqrt(\n" //
+  // + "59049*Pi^4)))^(1/3))/Pi},{y->((1-I*Sqrt(3))*(-243*Pi^2+Sqrt(59049*Pi^4))^(1/3))/(\n" //
+  // +
+  // "6*2^(1/3)*Pi),x->3/2*((1-I*Sqrt(3))*(-243*Pi^2+Sqrt(59049*Pi^4))^(1/3))/(2^(1/3)*Pi)},{y->((\n"
+  // //
+  // + "1+I*Sqrt(3))*(-243*Pi^2+Sqrt(59049*Pi^4))^(1/3))/(6*2^(1/3)*Pi),x->3/2*((1+I*Sqrt(\n" //
+  // + "3))*(-243*Pi^2+Sqrt(59049*Pi^4))^(1/3))/(2^(1/3)*Pi)}}");
+  // check("Solve({9==x/y, x==pi*y^4},{x,y}) //N", //
+  // "{{y->-(-243/2*Pi^2+Sqrt(59049*Pi^4)/2)^(1/3)/(3*Pi),x->(-3*(1/2*(-243*Pi^2+Sqrt(\n" //
+  // + "59049*Pi^4)))^(1/3))/Pi},{y->((1-I*Sqrt(3))*(-243*Pi^2+Sqrt(59049*Pi^4))^(1/3))/(\n" //
+  // +
+  // "6*2^(1/3)*Pi),x->3/2*((1-I*Sqrt(3))*(-243*Pi^2+Sqrt(59049*Pi^4))^(1/3))/(2^(1/3)*Pi)},{y->((\n"
+  // //
+  // + "1+I*Sqrt(3))*(-243*Pi^2+Sqrt(59049*Pi^4))^(1/3))/(6*2^(1/3)*Pi),x->3/2*((1+I*Sqrt(\n" //
+  // + "3))*(-243*Pi^2+Sqrt(59049*Pi^4))^(1/3))/(2^(1/3)*Pi)}}");
+  // check("Solve({x==Pi*y^2, 5==x/y}, {x,y})", //
+  // "{{y->5/Pi,x->25/Pi}}");
+  // }
+
   @Test
-  public void testIssue918() {
-    check("Solve({x==Pi*y^2, 5==x/y}, {x,y})", //
-        "{{y->5/Pi,x->25/Pi}}");
+  public void testIssue919() {
+    // check(
+    // "9810/(2758454771764429/2251799813685248*2*6250796477692329/562949953421312)", //
+    // "2072608731373155071447109740789760/5747513123739563366932509455047");
+    check(
+        "Solve(x==Sqrt(9810/(2758454771764429/2251799813685248*2*6250796477692329/562949953421312)),x)", //
+        "{{x->1125899906842624*Sqrt(1635/5747513123739563366932509455047)}}");
   }
 
-
   /** The JUnit setup method */
   @Override
   public void setUp() {