20210216 14:53:44 +0200  answered a question  evaluating inverse erf 
20210216 13:50:52 +0200  commented answer  evaluating inverse erf 
20210216 13:47:44 +0200  asked a question  probit, erfinv, and inconsistency with Wikipedia I've used the erfinv and outputs Wikipedia states that $\operatorname{probit}(0.025) = 1.96 = \operatorname{probit}(0.975)$ Interestingly outputs Am I missing a point here? 
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20210119 20:28:01 +0200  commented answer  Solving symbolic equations to IntegerModRing(26) [k_1 + 11x2, k_2 + 11x2, k_3, k_4 + 1, x1 + 23*x2, 2]. I've got this as an experiment, what is the value of k_3 and the last 2? 
20210119 20:24:05 +0200  commented answer  Solving symbolic equations to IntegerModRing(26) No automatic way form basis to eq.sub? 
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20210119 20:10:04 +0200  commented answer  Solving symbolic equations to IntegerModRing(26) Sorry, $i$ was a typo that takes your time. Is this the only way? I was expecting that the symbolic package can try solve by Gaussian Elimination. 
20210119 17:21:56 +0200  asked a question  Solving symbolic equations to IntegerModRing(26) To solve the Hill Cipher a have setup symbolic equations; There is a problem that The symbolic equations are not working modulo 26. For example, the first equation is So how can I properly turn them into modulo 26 and solve the equations in modulo 26? 
20210116 15:50:02 +0200  commented answer  Drawing a line not segment Sorry, cells mixed! I have put it into a curve defined over GF. Yes, it is working. Thanks. 
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20210115 23:58:51 +0200  commented answer  Drawing a line not segment

20210115 14:37:59 +0200  commented question  Drawing a line not segment @slelievre Thought that was not necessary, here it is. 
20210115 13:10:24 +0200  asked a question  Drawing a line not segment I want to draw a line passing through a point P and Q on an elliptic curve. Using this only draw a line segment from P to Q. How can I draw a line? I've looked on the doc but did not see an option for this. Any solution? 
20201020 21:31:55 +0200  commented answer  Multiplicative order of elements in a finite field defined by QuotientRing Oh, great, thanks. 
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20201020 20:05:43 +0200  asked a question  Multiplicative order of elements in a finite field defined by QuotientRing I've defined the AES's $\operatorname{GF}(2^8)$ field as follows; When I added the below and run it I've got this error;
I've seen this question How to find the multiplicative order of an element in a quotient ring over finite field ? but that is too complex to build. Is there an easy method? 
20200827 19:47:03 +0200  commented answer  Prevent sage from calculating a function? is there a solution for this one? finding inverse of en element wiht ExtGCD fails due to defining polynomial converts zero in function 
20200825 22:44:40 +0200  asked a question  finding inverse of en element wiht ExtGCD fails due to defining polynomial converts zero in function I'm trying to implement a fast ExtGCD to find the inverse of an element in the finite field $GF(2^8)$ of AES. When the $x^8+x^4+x^3+x+1$ is sent to this function it is converted to zero, so the Is there a way to protect the variable from converting to zero so that this function can work as intended? 
20200819 21:09:43 +0200  commented answer  elliptic curve scalar multiplication Without the $[n \bmod order]G$ check this code will fail as see on Stackoverflow : order of a point is not regular in Hessian Curve implementation 
20200818 21:50:50 +0200  commented answer  Defining Hessian Curve OK, This defines a general curve. Now it is hard to use the Elliptic curves over finite fields tools. Is there a way? 
20200817 13:05:26 +0200  asked a question  Defining Hessian Curve How do we define a Hessian Curve on SageMath. I've failed to find a source about this. The curve equation is this $$X^3 + Y^3 + cZ^3 = dXYZ$$ and paremetrazied with $c$ and $d$ over the field $GF(p)$ 
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20191212 14:43:12 +0200  commented answer  Sagemath refuses to load singular curve The shape of the singular point. Cusp or node. Of course, when drawing over the finite field, we got only point. Should I look at the curve over Q? 
20191211 20:41:15 +0200  commented answer  Sagemath refuses to load singular curve When I try to plot, I've the following error 
20191210 08:29:34 +0200  edited question  Sagemath refuses to load singular curve I know that this below Elliptic curve is singular at $(23796,0)$ Since $\frac{\partial f}{\partial x} = 3x^2 + 17230 =0 \pmod p$ and vanishes at $x={185,23796}$ and $(185,0)$ not on the curve. $\frac{\partial f}{\partial y} = 2y = 0 \pmod p$ and vanishes at $y=0$ I'm trying to define this curve to plot but SageMath gives the error;
How can I plot this curve? 