Mathematics
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Robert Cardona

Graduate Student in Pure Mathematics. Interested in

  1. Algebraic Topology & Homological Algebra (Chat Room)
  2. Algebraic & Topological K-Theory
  3. Functional Analysis, Index Theory & Differential Geometry (Chat Room)
  4. Algebraic Geometry (Chat Room), Commutative Algebra (Chat Room), Algebraic Stacks & Category Theory

On the side, I'm interested in learning about L-Theory, Homotopy Type Theory, Topos Theory and Constructive Mathematics.

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  • Barcelona, Spain
  • Member for 8 years, 10 months
  • 2,462 profile views
  • Last seen Jan 28 at 19:02

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28 A Banach space is reflexive if and only if its dual is reflexive Mar 26 '13
22 Show group of order $4n + 2$ has a subgroup of index 2. Oct 31 '12
17 Show $\langle a^m \rangle \cap \langle a^n \rangle = \langle a^{\operatorname{lcm}(m, n)}\rangle$ Apr 15 '12
17 Show that $d_b(x,y)=\frac{d(x,y)}{1+d(x,y)}$ is a metric. Feb 21 '13
16 If a connected open set is evenly covered, then its preimage is uniquely partitioned into slices Oct 7 '14
15 Real numbers equipped with the metric $ d (x,y) = | \arctan(x) - \arctan(y)| $ is an incomplete metric space Feb 3 '13
14 Proving that the set of limit points of a set is closed Jan 18 '13
13 The fiber of a covering space over a connected space has constant cardinality Sep 21 '14
13 Proof that $\mathbb Z[\sqrt{3}]$ is a Euclidean Domain Feb 18 '15
12 $\mathbb Z[\sqrt{-5}]$ is not a UFD Feb 11 '15
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