Category: Math 2017 Avoided a Duplicate Question Jan 07 2017 2016 Simplify a Determinant Identity Dec 29 2016 A Group of 689 Elements (2) Dec 15 2016 Indices in Definition of External Semidirect Product Dec 15 2016 No Schauder Base in $\ell^\infty$ Apr 05 2016 $\ell^\infty$ Is Not Separable Apr 02 2016 Approximation of a Bounded Simple Function by a Continuous Function Mar 21 2016 My Venn Diagram Mistake Feb 09 2016 Closedness vs Completeness Feb 07 2016 Generate $\rm \LaTeX$ Code for Octave Matrices Jan 16 2016 Some Families of Open Sets in $\Bbb R$ Jan 15 2016 2015 Residue at Infinity Dec 24 2015 Learnt Laurent Series Dec 20 2015 The $p$-th Root of a Convex Homogeneous Function of Degree $p$ Nov 30 2015 A Queue in $T_1$ Spaces Sep 28 2015 Mountain Climbing in Lindelöf $T_3$ Spaces Sep 28 2015 Normal Compact $T_2$ Spaces Sep 28 2015 Read Lucas's Theorem Sep 06 2015 Understood How Zorn's Lemma Implies the Axiom of Choice Sep 06 2015 Revised Absolute Convergence Sep 05 2015 Stuck at Two Trigonometric Inequalities Sep 04 2015 Found an Upper Bound for the Modulus of Legendre Polynomials Sep 03 2015 Some Thoughts on a Real-Valued Function Aug 04 2015 Found 2 Incomparable Topologies Apr 25 2015 Understood Euler Product Formula Apr 12 2015 Compared Two Poisson Variables Apr 10 2015 Calculating the Volume of a Triangular Pyramid in a Hard Way Apr 07 2015 Calculate the Expected Waiting Time in a Hard Way Apr 06 2015 Two Diagrams Illustrating the Isomorphism Extension Theorem Mar 28 2015 A Non-surjective Embedding Mapping a Field to Itself Mar 28 2015 Powers of Roots of Irreducible Polynomials in a Field With Characteristic $p$ Mar 15 2015 Learnt Cauchy–Bunyakovsky–Schwarz Inequality for Definite Integrals Feb 28 2015 Evaluated a Convolution Integral Feb 28 2015 Saw a New Type of Ring Feb 28 2015 Read a Proof of Existence of Algebraic Closure Feb 21 2015 Subring of Ring With Unity Jan 18 2015 2014 Read a Proof About the Transitivity of Characteristic Subgroups Dec 31 2014 Read an Alternative Proof of the Extreme Value Theorem Using Tagged Partitions Dec 30 2014 A Group of 689 Elements Dec 09 2014 Power Means With Infinite Exponents Nov 14 2014 Composition of Limits Nov 08 2014 Limit Superior and Limit Inferior Nov 08 2014 Product of GCD and LCM ★ Nov 04 2014 Understood Power Means Inequality for Integer Powers Oct 25 2014 A Fake Function Sep 07 2014 Weaker Group Axioms Sep 06 2014 Error Bound of the Fixed Point of Contraction Mappings Aug 11 2014 Limit of Distances in Metric Spaces Aug 10 2014 Pappus's Hexagon Theorem Jul 12 2014 Star of David in Pascal's Triangle Jul 12 2014 Adding Integrals Over Partitions Jun 21 2014 Enlarging a Rectangle Inside Another Jun 20 2014 Archimedean Sequence of Partitions of a Square Jun 19 2014 Definition of Content 0 Sets Jun 18 2014 Injectivity of Stable Mappings Jun 17 2014 An Unreported Mistake in "Advanced Calculus" Jun 16 2014