Def: A linear transformation is a function T : Rn → Rm which satisfies: (1) T(x + y) Question: If inverse functions “undo” our original functions, can they help
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Def: A linear transformation is a function T : Rn → Rm which satisfies: (1) T(x + y) Question: If inverse functions “undo” our original functions, can they help
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Linear Transformations
The two basic vector operations are addition and scaling. From this perspec- tive, the nicest functions are those which \preserve" these operations: Def:Alinear transformationis a functionT:Rn!Rmwhich satises: (1)T(x+y) =T(x) +T(y) for allx;y2Rn (2)T(cx) =cT(x) for allx2Rnandc2R. Fact:IfT:Rn!Rmis a linear transformation, thenT(0) =0. We've already met examples of linear transformations. Namely: ifAis anymnmatrix, then the functionT:Rn!Rmwhich is matrix-vector multiplicationT(x) =Ax
is a linear transformation. (Wait: I thought matriceswerefunctions? Technically, no. Matrices are lit- erally just arrays of numbers. However, matricesdenefunctions by matrix- vector multiplication, and such functions are always linear transformations.) Question:Are these all the linear transformations there are? That is, does every linear transformation come from matrix-vector multiplication? Yes: Prop 13.2:LetT:Rn!Rmbe a linear transformation. Then the function Tis just matrix-vector multiplication:T(x) =Axfor some matrixA.In fact, themnmatrixAis
A=24T(e1)T(en)3
5 Terminology:For linear transformationsT:Rn!Rm, we use the word \kernel" to mean \nullspace." We also say \image ofT" to mean \range ofT." So, for a linear transformationT:Rn!Rm:
ker(T) =fx2RnjT(x) =0g=T1(f0g) im(T) =fT(x)jx2Rng=T(Rn):Ways to Visualize functionsf:R!R(e.g.:f(x) =x2)
(1) Set-Theoretic Picture. (2) Graph off. (Thinking:y=f(x).)Thegraphoff:R!Ris the subset ofR2given by:
Graph(f) =f(x;y)2R2jy=f(x)g:
(3) Level sets off. (Thinking:f(x) =c.) Thelevel setsoff:R!Rare the subsets ofRof the form fx2Rjf(x) =cg; for constantsc2R. Ways to Visualize functionsf:R2!R(e.g.:f(x;y) =x2+y2) (1) Set-Theoretic Picture. (2) Graph off. (Thinking:z=f(x;y).)Thegraphoff:R2!Ris the subset ofR3given by:
Graph(f) =f(x;y;z)2R3jz=f(x;y)g:
(3) Level sets off. (Thinking:f(x;y) =c.) Thelevel setsoff:R2!Rare the subsets ofR2of the form f(x;y)2R2jf(x;y) =cg; for constantsc2R. Ways to Visualize functionsf:R3!R(e.g.:f(x;y;z) =x2+y2+z2) (1) Set-Theoretic Picture. (2) Graph off. (Thinking:w=f(x;y;z).) (3) Level sets off. (Thinking:f(x;y;z) =c.) Thelevel setsoff:R3!Rare the subsets ofR3of the form f(x;y;z)2R3jf(x;y;z) =cg; for constantsc2R.Curves inR2: Three descriptions
(1)Graph of a functionf:R!R. (That is:y=f(x))Such curves must pass the vertical line test.
Example:When we talk about the \curve"y=x2, we actually mean to say:the graph of the functionf(x) =x2.That is, we mean the set f(x;y)2R2jy=x2g=f(x;y)2R2jy=f(x)g: (2)Level sets of a functionF:R2!R. (That is:F(x;y) =c) Example:When we talk about the \curve"x2+y2= 1, we actually mean to say:the level set of the functionF(x;y) =x2+y2at height1.That is, we mean the set f(x;y)2R2jx2+y2= 1g=f(x;y)2R2jF(x;y) = 1g: (3)Parametrically:( x=f(t) y=g(t):Surfaces inR3: Three descriptions
(1)Graph of a functionf:R2!R. (That is:z=f(x;y).)Such surfaces must pass the vertical line test.
Example:When we talk about the \surface"z=x2+y2, we actually mean to say:the graph of the functionf(x;y) =x2+y2.That is, we mean the set (2)Level sets of a functionF:R3!R. (That is:F(x;y;z) =c.) Example:When we talk about the \surface"x2+y2+z2= 1, we actually mean to say:the level set of the functionF(x;y;z) =x2+y2+z2at height1.That is, we mean the set
f(x;y;z)2R3jx2+y2+z2= 1g=f(x;y;z)2R3jF(x;y;z) = 1g: (3)Parametrically. (We'll discuss this another time, perhaps.)Two Examples of Linear Transformations
(1)Diagonal Matrices: Adiagonal matrixis a matrix of the form D=2 6 664d100
0d20.........0
0 0dn3
7 775:The linear transformation dened byDhas the following eect: Vectors are...
Stretched/contracted (possibly re
ected) in thex1-direction byd1Stretched/contracted (possibly re
ected) in thex2-direction byd2...Stretched/contracted (possibly re
ected) in thexn-direction bydn.Stretching in thexi-direction happens ifjdij>1.
Contracting in thexi-direction happens ifjdij<1.
Re ecting happens ifdiis negative. (2)Rotations inR2 We writeRot:R2!R2for the linear transformation which rotates vectors inR2counter-clockwise through the angle. Its matrix is: cossin sincosThe Multivariable Derivative: An Example
Example:LetF:R2!R3be the function
F(x;y) = (x+ 2y;sin(x); ey) = (F1(x;y);F2(x;y);F3(x;y)): Itsderivativeis a linear transformationDF(x;y):R2!R3. The matrix of the linear transformationDF(x;y) is:DF(x;y) =2
6 4@F 1@x @F 1@y @F 2@x @F 2@y @F 3@x @F 3@y 3 7 5=2 41 2cos(x) 0 0ey3 5 Notice that (for example)DF(1;1) is a linear transformation, as isDF(2;3), etc. That is, eachDF(x;y) is a linear transformationR2!R3.