Research Summary
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Click here for a description of my research, past and present, and future intentions.
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Preprints and publications
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Click below to view my current papers and preprints
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Movies
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Click below for "movies" of link maps $f:S_+^2\cup S^2_{{}_-}\to S^4$ with Kirk's $\sigma$-invariant having $\sigma_+(f)=0$. In each movie, Whitney disks for $f(S^2_+)$ in the complement of $f(S^2_{{}_-})$ are illustrated. The intersections between these Whitney disks and $f(S^2_+)$ are also shown, so that Li's secondary obstruction $\omega_+(f)$ can be computed.
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