Jan Stevens

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math.AG2026

The versal deformation of small resolutions of conic bundles over $P^{1} \times P^{1}$ with two sections blown down

Bernd Kreussler, Jan Stevens

Twistor spaces are certain compact complex threefolds with an additional real fibre bundle structure. We focus here on twistor spaces over $3 C P^{2}$ . Such spaces ar…

math.AG2025

The versal deformation of elliptic m-fold point curve singularities

Jan Stevens

We give explicit, highly symmetric equations for the versal deformation of the singularity $L_{n + 1}^{n}$ consisting of n+1 lines through the origin in n-dimensional affine space in g…

The versal deformation of small resolutions of conic bundles over P1×P1 with two sections blown down

The versal deformation of elliptic m-fold point curve singularities

The versal deformation of small resolutions of conic bundles over $P^{1} \times P^{1}$ with two sections blown down