Symplectic tori in homotopy $\mathbf{E}(1)$'s

This short note presents a simple construction of nonisotopic symplectic tori representing the same primitive homology class in the symplectic $4$-manifold $E(1)_{K}$, obtained by knot surgery on the rational elliptic surface $E(1) = \mathbb{P} ^{2} \char93 9 {\overline{\mathbb{P} }^{2}}$ with the left-handed trefoil knot $K$. $E(1)_{K}$ has the simplest homotopy type among simply-connected symplectic $4$-manifolds known to exhibit such a property.