What is good code to work out the ideal of projective mappings in particular the ideal of the closure of the following mapping phi:P^1-->P^3 phi([x0:x1])=[x0^4:x0^3*x1:x0*x1^3:x1^4] the ideal of the veronese embedding P^1-->P^d, where d is a natural number >0 and the ideal of the Segre embedding P^1*P^m-->P^2m+1, where m is a natural number >0
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