Singular Manual: vector operations

| ### 4.23.3 vector operations `+` addition `-` negation or subtraction `/` division by a monomial, not divisible terms yield 0 `<`, `<=`, `>`, `>=`, `==`, `<>` comparators (considering leading terms w.r.t. monomial ordering) vector_expression `[` int_expressions `]` is a vector entry; the index 1 gives the first entry. Example:
      ring R=0,(x,y),(c,dp);
      [x,y]-[1,x];
    ==> [x-1,-x+y]
      [1,2,x,4][3];
    ==> x

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