2019-04-18 19:53:25 +0200 received badge ● Notable Question (source) 2015-06-23 20:59:21 +0200 received badge ● Popular Question (source) 2015-04-16 20:42:53 +0200 commented answer Is Einstein notation available in sage? Dear Eric, 1) I must to thanks for your attention. 2) I saw the details link you mentioned. Your theory is very good. because I deal with vector spaces as very special modules. It works and seems flexible in computations. But, here is a problem for me. Since I am working with tensors symbolically, I need to recognizing no fixed dimension. Cadabra serves this very good for me. But, I like to do all of my computation with sage and python only. 2015-04-16 12:11:13 +0200 received badge ● Student (source) 2015-04-16 00:28:23 +0200 received badge ● Editor (source) 2015-04-16 00:26:15 +0200 asked a question Is Einstein notation available in sage? Dear all I searched here. But I can not find a contented answer. There is a very usable notation in summations simplifying computations inclusive very $\Sigma$. Is there a way in Sage that I can use this kind of notation? For more information, this notation is worked out in Cadabra. 2015-04-15 20:07:28 +0200 commented answer A confusing syntax error when using elif @kcrisman Thank you Kcrisman. Sorry for this delaying. 2015-04-15 20:06:45 +0200 received badge ● Scholar (source) 2015-04-14 18:27:19 +0200 commented answer A confusing syntax error when using elif Thank you. I understand. 2015-04-14 18:04:19 +0200 asked a question A confusing syntax error when using elif Dear All This is my confusing problem: sage: m=31 sage: if m%3==0: ....: print m/3 ....: elif m%3==1: ....: print (m-1)/3 ....: File "", line 3 elif m%Integer(3)==Integer(1): ^ SyntaxError: invalid syntax sage:  I do not copy-paste the code. I have ubuntu14.04 and my sage version is 6.5.