Polynomial long division: Difference between revisions

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    .replace(" 1x"," x").replace("x^0 "," ").replace("x^1 ","x ")
    .replace("+ -", "- ");
-   if(str[0]=="+") str[1,*];  // leave leading space
+   if(not str)     return(" ");  // all zeros
+   if(str[0]=="+") str[1,*];     // leave leading space
    else            String("-",str[2,*]);
 }</lang>