Find <x,y> in Inner Product Spaces: 8+5i

In summary, the correct answer for the inner product of x and y is 8+5i. This involves taking the complex conjugate of one of the vectors before doing the inner product, as defined for inner products in complex spaces.
  • #1
snesnerd
26
0
Let x = (2,1+i,i) and y = (2-i,2,1+2i). Find <x,y>

So my work is the following:

2(2-i) + (1+i)2 + i(1+2i) = 4+i, but my book says the correct answer is 8+5i. Hmmm what am I doing wrong?
 
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  • #2
snesnerd said:
Let x = (2,1+i,i) and y = (2-i,2,1+2i). Find <x,y>

So my work is the following:

2(2-i) + (1+i)2 + i(1+2i) = 4+i, but my book says the correct answer is 8+5i. Hmmm what am I doing wrong?

The inner product in complex spaces involves taking the complex conjugate of one of the vectors before you do the inner product. Look up your definition of inner product. Otherwise it's not a real inner product. <x,x> won't be greater than or equal to 0.
 
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FAQ: Find <x,y> in Inner Product Spaces: 8+5i

What is an inner product space?

An inner product space is a mathematical structure that consists of a vector space equipped with an inner product, which is a mathematical operation that takes two vectors as inputs and produces a scalar as output. This operation satisfies certain properties, such as linearity and symmetry, and allows for the measurement of the angle between two vectors.

How is an inner product space different from a vector space?

An inner product space is a type of vector space, but with the added structure of an inner product. This means that in addition to the usual operations of addition and scalar multiplication, an inner product space also has the ability to measure angles and distances between vectors.

What does represent in an inner product space?

represents the inner product of two vectors, x and y. It is a scalar value that is obtained by applying the inner product operation to the two vectors. This value can be used to measure the angle between the two vectors, as well as their similarity or orthogonality.

How do you find in an inner product space?

To find in an inner product space, you first need to know the inner product operation for that particular space. This could be a dot product, a cross product, or a more general inner product formula. Once you have this, you can simply plug in the values of x and y to calculate the inner product.

What is the meaning of the complex number in "8+5i" in relation to an inner product space?

The complex number in "8+5i" represents the coefficients of the two vectors, x and y, in the inner product operation. In an inner product space, the inner product is typically defined as the sum of the products of the corresponding components of the two vectors. In this case, 8 and 5 represent the coefficients of the real and imaginary components of the vectors, respectively.

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