础产蝉迟谤补肠迟：
In 2006, Ibukiyama conjectured that there is a linear isomorphism between a space of Siegel cusp forms of degree 2 of integral weight and that of half-integral weight. With Arthur's multiplicity formula on the odd special orthogonal group SO(5) and Gan-Ichino's multiplicity formula on the metaplectic group Mp(4), Ibukiyama's conjecture can be proven in a representation theoretic way.
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