Help with parameters when computing volume












-1












$begingroup$


I have just started computing volume of objects confined by planes using Fubini and substitution and I have come across a problem that I can't figure out what new parameter to choose.



the planes are:



$z=xy$



$z=0$



$x+y+z=1$



Could you please help me?










share|cite|improve this question











$endgroup$












  • $begingroup$
    It is not clear to me what you mean by "new parameter to choose". Can you please elaborate? Thx
    $endgroup$
    – pendermath
    Jan 6 at 23:02










  • $begingroup$
    Also, can you be more specific about your problem and what approach have you taken?
    $endgroup$
    – pendermath
    Jan 6 at 23:03










  • $begingroup$
    I don't know how to say it in english. By I want to compute the integral dxdydz so for that I need to find a substitution that will give me better parameters to use in the Fubini. For example if the object that is given by the three planes is something cylindrical I would use cylindrical parameters as symetry usually helps :D I dunno how to explain it
    $endgroup$
    – Zuzana Mitterová
    Jan 6 at 23:55










  • $begingroup$
    The points $(x,y,z)$ that satisfy $z=xy$ do not form a plane. Do you have a copy of the original problem?
    $endgroup$
    – John Douma
    Jan 7 at 0:26










  • $begingroup$
    Yes they do, in 3D. It's a curved plane. Or maybe plane is not a good name for it, sorry for my english.
    $endgroup$
    – Zuzana Mitterová
    Jan 7 at 10:33
















-1












$begingroup$


I have just started computing volume of objects confined by planes using Fubini and substitution and I have come across a problem that I can't figure out what new parameter to choose.



the planes are:



$z=xy$



$z=0$



$x+y+z=1$



Could you please help me?










share|cite|improve this question











$endgroup$












  • $begingroup$
    It is not clear to me what you mean by "new parameter to choose". Can you please elaborate? Thx
    $endgroup$
    – pendermath
    Jan 6 at 23:02










  • $begingroup$
    Also, can you be more specific about your problem and what approach have you taken?
    $endgroup$
    – pendermath
    Jan 6 at 23:03










  • $begingroup$
    I don't know how to say it in english. By I want to compute the integral dxdydz so for that I need to find a substitution that will give me better parameters to use in the Fubini. For example if the object that is given by the three planes is something cylindrical I would use cylindrical parameters as symetry usually helps :D I dunno how to explain it
    $endgroup$
    – Zuzana Mitterová
    Jan 6 at 23:55










  • $begingroup$
    The points $(x,y,z)$ that satisfy $z=xy$ do not form a plane. Do you have a copy of the original problem?
    $endgroup$
    – John Douma
    Jan 7 at 0:26










  • $begingroup$
    Yes they do, in 3D. It's a curved plane. Or maybe plane is not a good name for it, sorry for my english.
    $endgroup$
    – Zuzana Mitterová
    Jan 7 at 10:33














-1












-1








-1





$begingroup$


I have just started computing volume of objects confined by planes using Fubini and substitution and I have come across a problem that I can't figure out what new parameter to choose.



the planes are:



$z=xy$



$z=0$



$x+y+z=1$



Could you please help me?










share|cite|improve this question











$endgroup$




I have just started computing volume of objects confined by planes using Fubini and substitution and I have come across a problem that I can't figure out what new parameter to choose.



the planes are:



$z=xy$



$z=0$



$x+y+z=1$



Could you please help me?







substitution






share|cite|improve this question















share|cite|improve this question













share|cite|improve this question




share|cite|improve this question








edited Jan 6 at 23:10









Gnumbertester

425111




425111










asked Jan 6 at 22:56









Zuzana MitterováZuzana Mitterová

496




496












  • $begingroup$
    It is not clear to me what you mean by "new parameter to choose". Can you please elaborate? Thx
    $endgroup$
    – pendermath
    Jan 6 at 23:02










  • $begingroup$
    Also, can you be more specific about your problem and what approach have you taken?
    $endgroup$
    – pendermath
    Jan 6 at 23:03










  • $begingroup$
    I don't know how to say it in english. By I want to compute the integral dxdydz so for that I need to find a substitution that will give me better parameters to use in the Fubini. For example if the object that is given by the three planes is something cylindrical I would use cylindrical parameters as symetry usually helps :D I dunno how to explain it
    $endgroup$
    – Zuzana Mitterová
    Jan 6 at 23:55










  • $begingroup$
    The points $(x,y,z)$ that satisfy $z=xy$ do not form a plane. Do you have a copy of the original problem?
    $endgroup$
    – John Douma
    Jan 7 at 0:26










  • $begingroup$
    Yes they do, in 3D. It's a curved plane. Or maybe plane is not a good name for it, sorry for my english.
    $endgroup$
    – Zuzana Mitterová
    Jan 7 at 10:33


















  • $begingroup$
    It is not clear to me what you mean by "new parameter to choose". Can you please elaborate? Thx
    $endgroup$
    – pendermath
    Jan 6 at 23:02










  • $begingroup$
    Also, can you be more specific about your problem and what approach have you taken?
    $endgroup$
    – pendermath
    Jan 6 at 23:03










  • $begingroup$
    I don't know how to say it in english. By I want to compute the integral dxdydz so for that I need to find a substitution that will give me better parameters to use in the Fubini. For example if the object that is given by the three planes is something cylindrical I would use cylindrical parameters as symetry usually helps :D I dunno how to explain it
    $endgroup$
    – Zuzana Mitterová
    Jan 6 at 23:55










  • $begingroup$
    The points $(x,y,z)$ that satisfy $z=xy$ do not form a plane. Do you have a copy of the original problem?
    $endgroup$
    – John Douma
    Jan 7 at 0:26










  • $begingroup$
    Yes they do, in 3D. It's a curved plane. Or maybe plane is not a good name for it, sorry for my english.
    $endgroup$
    – Zuzana Mitterová
    Jan 7 at 10:33
















$begingroup$
It is not clear to me what you mean by "new parameter to choose". Can you please elaborate? Thx
$endgroup$
– pendermath
Jan 6 at 23:02




$begingroup$
It is not clear to me what you mean by "new parameter to choose". Can you please elaborate? Thx
$endgroup$
– pendermath
Jan 6 at 23:02












$begingroup$
Also, can you be more specific about your problem and what approach have you taken?
$endgroup$
– pendermath
Jan 6 at 23:03




$begingroup$
Also, can you be more specific about your problem and what approach have you taken?
$endgroup$
– pendermath
Jan 6 at 23:03












$begingroup$
I don't know how to say it in english. By I want to compute the integral dxdydz so for that I need to find a substitution that will give me better parameters to use in the Fubini. For example if the object that is given by the three planes is something cylindrical I would use cylindrical parameters as symetry usually helps :D I dunno how to explain it
$endgroup$
– Zuzana Mitterová
Jan 6 at 23:55




$begingroup$
I don't know how to say it in english. By I want to compute the integral dxdydz so for that I need to find a substitution that will give me better parameters to use in the Fubini. For example if the object that is given by the three planes is something cylindrical I would use cylindrical parameters as symetry usually helps :D I dunno how to explain it
$endgroup$
– Zuzana Mitterová
Jan 6 at 23:55












$begingroup$
The points $(x,y,z)$ that satisfy $z=xy$ do not form a plane. Do you have a copy of the original problem?
$endgroup$
– John Douma
Jan 7 at 0:26




$begingroup$
The points $(x,y,z)$ that satisfy $z=xy$ do not form a plane. Do you have a copy of the original problem?
$endgroup$
– John Douma
Jan 7 at 0:26












$begingroup$
Yes they do, in 3D. It's a curved plane. Or maybe plane is not a good name for it, sorry for my english.
$endgroup$
– Zuzana Mitterová
Jan 7 at 10:33




$begingroup$
Yes they do, in 3D. It's a curved plane. Or maybe plane is not a good name for it, sorry for my english.
$endgroup$
– Zuzana Mitterová
Jan 7 at 10:33










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