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visits member for 3 years, 1 month
seen Nov 24 at 12:58

Oct
12
answered Have any definitions in mathematics been redefined
Jul
27
comment Probability of Dialing Correct Digits
How many two digit numbers are there without a zero? And how many of them are the correct number?
Jul
27
accepted What type of algebra are Valiant's algebras for context-free grammars?
Jul
24
comment What are some conceptualizations that work in mathematics but are not strictly true?
@paulgarrett Surely if one gives up "pointwise values", one is working in the theory of distributions?
Jul
19
answered What type of algebra are Valiant's algebras for context-free grammars?
Jul
18
asked What type of algebra are Valiant's algebras for context-free grammars?
Jul
15
comment Why Limit of $0/x$ is $0$, if $x$ approaches $0$?
If somebody doesn't understand such a basic fact about limits, it's probably not the right time to introduce L'Hôpital's rule
Jul
14
comment What does “formal” mean?
Regarding the last sentence: it is, in particular, well understood how to make formal manipulation of power series rigourous (i.e., how to define the ring R[[x]] formally).
Jun
23
comment If A = B, then B = A… Not Always True? Definition of “=”
This is simply an example where the English word "is" does not mean "=". As Bill Clinton said, it depends what the meaning of "is" is.
Apr
2
comment Visually stunning math concepts which are easy to explain
@joeA: it's not as smooth as regenerating at a higher framerate, but gfycat.com allows one to view gifs at different speeds: gfycat.com/TintedWatchfulAxisdeer#?speed=0.25
Apr
2
revised Why do we use lowercase $k$ for fields?
closing paren
Apr
2
comment Why do we use lowercase $k$ for fields?
@WillJagy: yes, I deliberately said "not uncommon" rather than "usual". F and K seem to be at least as common as k.
Apr
2
awarded  Yearling
Apr
2
asked Why do we use lowercase $k$ for fields?
Mar
14
answered need orthogonal basis for R3. i'm given one of them. how do i find the rest?
Mar
14
comment Is this form of finite induction correctly called “downward induction”
That may be a name for this principle, but a Google search indicates "finite descent" is even less used than "downward induction". It also seems less transparent to somebody who doesn't know the term. And according to this, the term is reserved for a contrapositive/negative version of the principle.
Mar
14
asked Is this form of finite induction correctly called “downward induction”
Mar
8
awarded  Critic
Mar
8
revised Weak law of large numbers: counterexample for independent but not i.i.d. variables
more detailed title
Mar
8
suggested approved edit on Weak law of large numbers: counterexample for independent but not i.i.d. variables