CoCoA:HowTo:Use Modular Numbers: Difference between revisions

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== Modular Numbers ==
== Modular Numbers ==
=== Question ===
=== Question ===
What's wrong in this?
   Use R::=Z/(5)[x];
   Use R::=Z/(5)[x];
   5x+2y;
   5x+2y;
  2y
  2y
---
-------------------------------
   5=0;
   5=0;
  FALSE :-((
  FALSE
---
-------------------------------
 
Moreover this throws an error
Use R::=Z/(5);
  Use R::=Z/(5);
=== Answer ===
=== Answer ===
   Type(5);
   Type(5);

Revision as of 14:41, 29 November 2005

Modular Numbers

Question

What's wrong in this?

  Use R::=Z/(5)[x];
  5x+2y;
2y

  5=0;
FALSE

Moreover this throws an error

  Use R::=Z/(5);

Answer

 Type(5);

INT


5 e' un intero, e gli interi non dipendono dall'anello corrente (puoi immaginarti cosa succederebbe a un ciclo For?)

per vedere 5 come modulare devi fare:

 5 % 5;

0 % 5


(analogo al C) oppure immergerlo nell'anello di polinomi

 Use R::=Z/(5)[x];
 Poly(5);

0