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visits member for 3 years, 7 months
seen Jul 29 at 20:09

Jul
2
awarded  Curious
Apr
10
awarded  Popular Question
Jan
20
awarded  Yearling
Nov
14
awarded  Notable Question
Nov
4
awarded  Nice Question
Sep
8
answered Propositional logic: Finding a formula F with statement variables from truth table
Sep
4
comment What does $\forall a \in A \exists b \in B(b \in C \rightarrow a \in C)$ mean?
Oh okay, I see. I'm getting confused. Thank you for the clarification.
Sep
4
comment What does $\forall a \in A \exists b \in B(b \in C \rightarrow a \in C)$ mean?
But actually it's not quite a function because there could be more than one $b$ that qualifies, right? In other words $\exists$ means there is at least one.
Sep
4
comment What does $\forall a \in A \exists b \in B(b \in C \rightarrow a \in C)$ mean?
Wow, you blew my mind when you said it says there's a function. I need a minute to mull that over.
Sep
4
comment What does $\forall a \in A \exists b \in B(b \in C \rightarrow a \in C)$ mean?
Yeah, I think that's understood. A, B, and C are arbitrary sets.
Sep
4
comment What does $\forall a \in A \exists b \in B(b \in C \rightarrow a \in C)$ mean?
What would $\forall C$ mean?
Sep
4
asked What does $\forall a \in A \exists b \in B(b \in C \rightarrow a \in C)$ mean?
Jul
19
awarded  Popular Question
May
12
awarded  Caucus
Jan
25
awarded  Popular Question
Jan
20
awarded  Yearling
Aug
5
accepted When should the antiderivative of a rational function be defined as a piecewise function?
Jul
18
comment Proving a linear system $A\bf{x} = \bf{b}$ is consistent iff the rank of ($A\;|\;\bf{b}$) equals the rank of $A$
Thanks! That's a very intuitive way of looking at it.
Jul
18
accepted Proving a linear system $A\bf{x} = \bf{b}$ is consistent iff the rank of ($A\;|\;\bf{b}$) equals the rank of $A$
Jul
9
accepted If $Q \in \mathbb{R}^{n \times n}$ is both upper triangular and orthogonal, then $\textbf{q}_j = \pm \textbf{e}_j, j = 1,\ldots, n$