- #1
sponsoredwalk
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What is the set of all functions, and as a consequence the set of all m x n matrices
supposed to look like?
S = {(x₁,x₂,...,x₊)|x₁,x₂,...,x₊∊R} is a regular vector space, another notation I've seen for this is:
S = {α ∊ (x₁,x₂,...,x₊)|x₁,x₂,...,x₊∊R} which clearly indicates α is a vector and the operations
defined on S are:
+ : S x S → S defined by + : (α,β) ↦ α + β = (x₁,x₂,...,x₊) + (y₁,y₂,...,y₊) = ...
• : S x F → F defined by • : (α,c) ↦ (cα) = c(x₁,x₂,...,x₊) = ...Now, if we look at the set of functions we see that:
+ : S x S → S defined by + : (f,g) ↦ (f + g)(x) = f(x) + g(x)
• : S x F → F defined by • : (f,β) ↦ (βf)(x) = βf(x).
so would my set be
S = {(f,g,...,j)|f,g,...,j∊R}
or
S = {f ∊ (x₁,x₂,...,x₊)|x₁,x₂,...,x₊∊R}?
I can't get the set of functions to follow the format I've used above and I don't
think either of those sets I just described make sense tbh Then with matrices, if we look at how + & • are defined for functions and notice that a
matrix is just the function
f : (i,j) ↦ A(i,j) = Aij
it seems reasonable that the vector space of matrices is defined in the same way as the
vector space of functions.
I am really not sure, I have a feeling that for matrices the operations are
defined along the lines of:
+ : Fm x n x Fm x n → Fm x n defined by + : (i,j) ↦ (A + B)(i,j) = A(i,j) + B(i,j) = Aij + Bij
• : Fm x n x F → Fm x n defined by • : ((i,j),β) ↦ (βA)(i,j) = βA(i,j) = βAij
rather than
+ : S x S → S defined by + : (f,g) ↦ (f + g)(x) = f(x) + g(x)
• : S x F → F defined by • : (f,β) ↦ (βf)(x) = βf(x)
because that notation suggests the m x n dimension characteristic of matrices where
the standard function notation obscures it (I think). Notice the last bit of notation
(the (f,g) ↦ (f + g)(x) stuff for matrices) really doesn't make sense eitherso I don't
think it can be along these lines.
So, to sum up I'm just asking about the notation describing the vector space of functions
and as a consequence of this the notation for the vector space of all mxn matrices.
What say you?
supposed to look like?
S = {(x₁,x₂,...,x₊)|x₁,x₂,...,x₊∊R} is a regular vector space, another notation I've seen for this is:
S = {α ∊ (x₁,x₂,...,x₊)|x₁,x₂,...,x₊∊R} which clearly indicates α is a vector and the operations
defined on S are:
+ : S x S → S defined by + : (α,β) ↦ α + β = (x₁,x₂,...,x₊) + (y₁,y₂,...,y₊) = ...
• : S x F → F defined by • : (α,c) ↦ (cα) = c(x₁,x₂,...,x₊) = ...Now, if we look at the set of functions we see that:
+ : S x S → S defined by + : (f,g) ↦ (f + g)(x) = f(x) + g(x)
• : S x F → F defined by • : (f,β) ↦ (βf)(x) = βf(x).
so would my set be
S = {(f,g,...,j)|f,g,...,j∊R}
or
S = {f ∊ (x₁,x₂,...,x₊)|x₁,x₂,...,x₊∊R}?
I can't get the set of functions to follow the format I've used above and I don't
think either of those sets I just described make sense tbh Then with matrices, if we look at how + & • are defined for functions and notice that a
matrix is just the function
f : (i,j) ↦ A(i,j) = Aij
it seems reasonable that the vector space of matrices is defined in the same way as the
vector space of functions.
I am really not sure, I have a feeling that for matrices the operations are
defined along the lines of:
+ : Fm x n x Fm x n → Fm x n defined by + : (i,j) ↦ (A + B)(i,j) = A(i,j) + B(i,j) = Aij + Bij
• : Fm x n x F → Fm x n defined by • : ((i,j),β) ↦ (βA)(i,j) = βA(i,j) = βAij
rather than
+ : S x S → S defined by + : (f,g) ↦ (f + g)(x) = f(x) + g(x)
• : S x F → F defined by • : (f,β) ↦ (βf)(x) = βf(x)
because that notation suggests the m x n dimension characteristic of matrices where
the standard function notation obscures it (I think). Notice the last bit of notation
(the (f,g) ↦ (f + g)(x) stuff for matrices) really doesn't make sense eitherso I don't
think it can be along these lines.
So, to sum up I'm just asking about the notation describing the vector space of functions
and as a consequence of this the notation for the vector space of all mxn matrices.
What say you?
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