You are Here: Home >< Maths

# Applying boundary conditions on a multivariable function Watch

1. How do I apply the boundary conditions on this integral to determine the constant?
A is the constant to be found.

There should be a plus 1 outside of the integral
i.e u = integral +1

I have an answer but don't understand it:

"u = 0 since as t tends to ot for fixed y, 'n' tends to ot"
Attached Images

2. (Original post by Calculator878)
How do I apply the boundary conditions on this integral to determine the constant?
A is the constant to be found.

There should be a plus 1 outside of the integral
i.e u = integral +1

I have an answer but don't understand it:

"u = 0 since as t tends to ot for fixed y, 'n' tends to ot"
I'm afraid it's not entirely clear what you're asking - do you mean u = A(1 + Integral)?

Anyway, the integral is a constant times the error function - and this is a function that has a sigmoid shape going from -1 at negative infinity to 1 at positive infinity. To look at , let y tend to infinity; to look at , let t tend to zero and see how the integral behaves in each case.

TSR Support Team

We have a brilliant team of more than 60 Support Team members looking after discussions on The Student Room, helping to make it a fun, safe and useful place to hang out.

This forum is supported by:
Updated: April 5, 2016
Today on TSR

### Last-minute PS help

100s of personal statements examples here

### More pressure for kinky sex?

Discussions on TSR

• Latest
• ## See more of what you like on The Student Room

You can personalise what you see on TSR. Tell us a little about yourself to get started.

• Poll
Useful resources

### Maths Forum posting guidelines

Not sure where to post? Read the updated guidelines here

### How to use LaTex

Writing equations the easy way

### Study habits of A* students

Top tips from students who have already aced their exams

## Groups associated with this forum:

View associated groups
Discussions on TSR

• Latest
• ## See more of what you like on The Student Room

You can personalise what you see on TSR. Tell us a little about yourself to get started.

• The Student Room, Get Revising and Marked by Teachers are trading names of The Student Room Group Ltd.

Register Number: 04666380 (England and Wales), VAT No. 806 8067 22 Registered Office: International House, Queens Road, Brighton, BN1 3XE

Reputation gems: You get these gems as you gain rep from other members for making good contributions and giving helpful advice.