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Jan
20
revised Do We Need the Digits of $\pi$?
added 19 characters in body
Oct
14
answered Sphere equation given 4 points
Oct
11
awarded  Yearling
Sep
25
revised Explaining percentages
added 24 characters in body
Jul
12
comment How to prove that the Fibonacci sequence is periodic mod 5 without using induction?
@lulu but you can know the max period is 25 because that's how many pairs of numbers there are mod 5.
Jul
12
comment How to prove that the Fibonacci sequence is periodic mod 5 without using induction?
No-one used the closed form and expanded it out in the answers?
Mar
6
comment How is another root -i?
@SophieClad that is only true of quadratic equations with coefficients in R
Feb
20
awarded  Nice Answer
Feb
18
answered How to find the linear matrix of this linear transformation?
Feb
13
awarded  Nice Answer
Feb
12
revised Is there a commutative operation for which the inverse of the operation is also commutative?
edited body
Feb
12
answered Is there a commutative operation for which the inverse of the operation is also commutative?
Feb
11
revised Is there a size of rectangle that retains its ratio when it's folded in half?
fixing the formatting
Feb
11
suggested approved edit on Is there a size of rectangle that retains its ratio when it's folded in half?
Jan
9
comment Why is inverse of orthogonal matrix is its transpose?
actually it's not: [[2,0][0,2]] is orthogonal but its inverse is [[0.5,0][0,0.5]]. I think you mean orthonormal
Dec
15
awarded  Caucus
Nov
13
comment Why is the absolute sign needed in the definition of a bounded function
+1 for going to the intent of the notation
Nov
5
awarded  Custodian
Nov
5
reviewed Approve Finding Transformation matrix between two 2D coordinate frames [Pixel Plane to World Coordinate Plane]
Oct
11
awarded  Yearling