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Oct
27
comment open interval written as countable union of closed intervals
Formal verification relies on the Archimedean property of $\mathbb{R}$.
Oct
14
comment Notation: subscript vs. superscript for coordinate vector fields
Hi, IMO the video is saying there are two ways to extract meaningful coordinates in an oblique coordinate system: taking orthogonal projection to oblique axes gives a covariant vector; parallel projections gives a contravariant vector. Neither is wrong or right by itself. The key is that inner product of covariant and contravariant gives an invariant independent of obliqueness of coordinate system. This invariant is exactly norm-squared when in orthogonal coordinates where covariant = contravariant. So both projections are part of understanding length. Does that help? @EricAuld
Oct
14
comment Gauss Disq. Arithm. Translation Errata?
+1 A bold project -- well done!
Oct
1
awarded  Yearling
Sep
30
awarded  Explainer
Sep
24
awarded  Autobiographer
Sep
22
revised Notation: subscript vs. superscript for coordinate vector fields
Added reference
Sep
22
suggested rejected edit on Matrix rows notation
Aug
12
revised Notation: subscript vs. superscript for coordinate vector fields
Put picture before explanation.
Aug
12
answered Notation: subscript vs. superscript for coordinate vector fields
Aug
11
revised Notation: subscript vs. superscript for coordinate vector fields
Revised the phrasing to avoid ambiguity by putting the descriptor before each example.
Aug
11
suggested approved edit on Notation: subscript vs. superscript for coordinate vector fields
Aug
11
comment Parenthesis vs brackets for matrices
No, ll ll is a notation usually reserved for the norm of a matrix.
Jul
7
revised Keep getting generating function wrong (making change for a dollar)
Added the actual problem into title so it surfaces when searching for making change.
Jul
7
suggested approved edit on Keep getting generating function wrong (making change for a dollar)
Jul
7
comment Making Change for a Dollar (and other number partitioning problems)
Worth noting that the list of available denominations in this version includes the non-change making option of $1.00. The solution is of course 292 for the usual version with strictly smaller denominations up to 50c (George Polya in How To Solve It, 1971).
Jul
7
comment Making Change for a Dollar (and other number partitioning problems)
(+1) Very interesting references.
Jul
3
revised How do I read this question? (subject: bijections)
OP had acknowledge AKE. AKE's handle has changed to Assad Ebrahim. Updated the reference.