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Additive cohomology operation - Admissible map - Admissible monomial - Admissible sequence -
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Anabelian geometry - Ancillarity - Acyclic covering - Albanese map - Algebraic equivalence of divisors - Approximative point-spectrum - Alcove - Associated curve - Associated line bundle - Acceptable Lie group - Accommodating orbit - Almost complex mapping - Analytic domination - Analytic vector - Algebra over a coalgebra - Atiyah-Hirzebruch-Whitehead spectral sequence - Asymptotic periods - Antifounded set theory - Abelian defect group conjecture - Alperin-McKay conjecture - Anick's conjecture -