User Decaf-Math - Mathematics Meta Stack Exchange

Decaf-Math

Member for 9 years
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10

Are there any irrational numbers that have a difference of a rational number?

7

Proof that the Period of $\sin(x)$ is $2\pi$.

7

Let $P \in M_n(\mathbb C)$ be idempotent. Prove that all nonzero singular values of $P$ satisfy $\sigma_i \ge 1$

6

Transversals of Latin Squares

6

Finding the dimension of $S = \{B \in M_n \,|\, AB = BA\}$, where $A$ is a diagonalizable matrix