A Zeuthen-Segre invariant is an invariant of complex projective
surfaces.
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Subspace Explorers was created in 1965.
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Subspace Encounter was created in 1983.
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Subspace Explorers has 278 pages.
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You can find information relating to subspace at websites such
as Get Continuum and Khan Academy. You can also find videos on
YouTube that explain subspace as well.