He is worried for his parents, who live in Mykolaiv, a port city on the Black Sea where Abramenko was raised. It sits between the occupied city of Kherson and Odessa, expected to be a key target of the Russians.

In this paper we define the notion of realizing a homology class up to cobordism; it is shown that for realization in this weaker sense immersions are sufficient, but maps with a fixed finite set of multisingularities are still insufficient..

We report ferrielectricity in a single-phase crystal, TSCC -- tris-sarcosine calcium chloride [(CH3NHCH2COOH)3CaCl2].

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