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Lopez C.P. - Differential Calculus using Mathematica

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Cesar Lopez Perez, 2016. 246 p. ISBN: 152343905XMathematica is a platform for scientific computing that helps you to work in virtually all areas of the experimental sciences and engineering. In particular, this software presents quite extensive capabilities and implements a large number of commands enabling you to efficiently handle problems involving Differential Calculus. Using Mathematica you will be able to work with Limits, Numerical and power series, Taylor and MacLaurin series, continuity, derivability, differentiability in several variables, optimization and differential equations. Mathematica also implements numerical methods for the approximate solution of differential equations.Limits And Continuity. One And Several Variables:
Limits Of Sequences
Limits Of Functions. Lateral Limits
Continuity
Several Variables: Limits And Continuity. Characterization Theorems
Iterated And Directional Limits
Continuity In Several Variables
Numerical Series And Power Series
Series. Convergence Criteria
Numerical Series With Non-Negative Terms
Alternating Numerical Series
Power Series
Power Series Expansions And Functions
Taylor And Laurent Expansions
Derivatives And Applications. One And Several Variables
The Concept Of The Derivative
Calculating Derivatives
Tangents, Asymptotes, Concavity, Convexity, Maxima And Minima, Inflection Points And Growth
Applications To Practical Problems
Partial Derivatives
Implicit Differentiation
Derivability In Several Variables
Differentiation Of Functions Of Several Variables
Maxima And Minima Of Functions Of Several Variables
Conditional Minima And Maxima. The Method Of Lagrange Multipliers
Some Applications Of Maxima And Minima In Several Variables
Vector Differential Calculus And Theorems In Several Variables
Concepts Of Vector Differential Calculus
The Chain Rule
The Implicit Function Theorem
The Inverse Function Theorem
The Change Of Variables Theorem
Taylors Theorem With N Variables
Vector Fields. Curl, Divergence And The Laplacian
Coordinate Transformation
Differential Equations
Separation Of Variables
Homogeneous Differential Equations
Exact Differential Equations
Linear Differential Equations
Numerical Solutions To Differential Equations Of The First Order
Ordinary High-Order Equations
Higher-Order Linear Homogeneous Equations With Constant Coefficients
Non-Homogeneous Equations With Constant Coefficients. Variation Of Parameters
Non-Homogeneous Linear Equations With Variable Coefficients. Cauchy-Euler Equations
The Laplace Transform
Systems Of Linear Homogeneous Equations With Constant Coefficients
Systems Of Linear Non-Homogeneous Equations With Constant Coefficients
Higher Order Equations And Approximation Methods
The Euler Method
The RungeKutta Method
Differential Equations Systems By Approximate Methods
Differential Equations In Partial Derivatives
Orthogonal Polynomials

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Differential Calculus usingMATHEMATICACSAR PREZ LPEZ
INDEX
Chapter 1. Limits AND CONTINUITY. ONE and several VARIABLES Mathematica provides commands that allow you tocalculate virtually all types of limits. The same functions are used tocalculate limits of sequences and limits of functions. The commands for theanalysis of one and several variables are similar. In this chapter we willpresent numerous exercises which illustrate Mathematicas capabilities in thisfield.

The syntax of the commands concerning limits are presented below: Limit(sequence, n->infinity) calculates the limit as n tends to infinity of the sequencedefined by its general term.Nlimit(sequence, n->infinity)calculates the limit as n tends to infinity of the sequence definedby its general term. This function is implemented in the package"Numerical Math" and is used when the Limit function can not solvethe problemLimit(function,x->a) calculates the limit of the function of the variablex, indicated by its analytical expression, as the variable xtends towards the value a.Nlimit(function, x->a) calculatesthe limit of the function of the variable x, indicated by its analyticalexpression, as the variable x tends towards the value a. Thisfunction is implemented in the package "Numerical Math" and is usedwhen the Limit function can not solve the problemLimit(function, x->a,Direction->1)calculates the limit of thefunction of the variable x, indicated by its analytical expression, as thevariable x tends to the value a from the right .Limit(function,x->a, Direction->1)calculates the limit of thefunction of the variable x, indicated by its analytical expression, as thevariable x tends to the value a from the left .

1.1 Limits of sequences
We present someexercises on the calculation of limits of sequences. Exercise 1-1. Calculatethe following limits:Differential Calculus using Mathematica - image 1, Differential Calculus using Mathematica - image 2, Differential Calculus using Mathematica - image 3, Differential Calculus using Mathematica - image 4 In the first two limits we face the typical uncertaintygiven by the quotient Picture 5 : In[1]:=Limit[((2n-3)/(3n-7))^4, n->Infinity]16/81In[2]:= Limit[(3n^3+7 n^2+1)/(4 n^3-8 n+5), n->Infinity] - The last two limits present an uncertainty of the form Picture 6 and Differential Calculus using Mathematica - image 7 : In[1]:=Limit[((n+1)/2)((n^4+1)/n^5), n->Infinity]-In[2]:=Limit[((n+1)/n^2)^(1/n), n->Infinity]Exercise 1-2. Calculatethe following limits:Differential Calculus using Mathematica - image 8, Differential Calculus using Mathematica - image 9, Differential Calculus using Mathematica - image 10, Differential Calculus using Mathematica - image 11, Picture 12 The first two examples are indeterminate of the form Picture 13 : In[1]:=Limit[((n+3)/(n-1))^n,n->Infinity]EIn[2]:=Limit[(1-2/(n+3))^n,n->Infinity]-2E The next two limits are of the form Differential Calculus using Mathematica - image 14 and Differential Calculus using Mathematica - image 15 : In[1]:=Limit[(1/n)^(1/n),n->Infinity]In[2]:=Limit[((n+1)^(1/3)-n^(1/3))/((n+1)^(1/2)-n^(1/2)), n->Infinity] The last limit is of the form Picture 16 : In[2]:=Limit[n!/n^n,n->Infinity]Series::esss:Essential singularityencountered in1 3Gamma[- + 1 + O[n] ].nSeries::esss:Essential singularity encountered in1 3Gamma[- + 1 + O[n] ].nn!Limit[--, n -> Infinity]nn The Limit function does not solve the problem.

We use Nlimit, andload the appropriate package, if it is not already in memory. In[3]:=<In[4]:=NLimit[n!/n^n,n->Infinity]

1.2 Limits of functions. Lateral limits
To calculate the limits offunctions one uses the same Mathematica commands as for limits of sequences. Forfunctions, Mathematica allows you to calculate the limit at a point, and leftand right limits (if these limits exist). If a function has a limit at a pointthen it necessarily has left and right limits at that point, and they coincide.If the left and right limits do not coincide then the function does not have alimit at the given point. Below are several exercises which illustrate how tocalculate function limits.

Some exercises are accompanied by graphics. The useof graphics is advisable if there are any doubts concerning the results. Exercise 1-3. Calculatethe following limits:Initially we have fourindeterminates of type and one of the form - photo 17 Initially, we have fourindeterminates of type Picture 18 and one of the form Picture 19 : In[1]:=Limit[(x-1)/(x^(1/2)-1),x->1]In[2]:=Limit[(x-(x+2)^(1/2))/((4x+1)^(1/2)-3),x->2]-In[1]:= Limit[(1+x)^(1/x),x->0]EIn[3]:=Limit[Sin[ax]^2/x^2,x->0]aExercise 1-4. Calculatethe following function limits:The first limit is calculated as follows - photo 20 The first limit is calculated as follows: In[1]:=Limit[Abs[x]/Sin[x],x->0]Limit[Abs[x] Csc[x],x -> 0]In[2]:=Limit[Abs[x]/Sin[x],x->0,Direction->1]Limit[Abs[x] Csc[x],x -> 0, Direction -> 1]In[3]:=Limit[Abs[x]/Sin[x],x->0,Direction->-1]Limit[Abs[x] Csc[x],x -> 0, Direction -> -1] We note that we can not calculate directly, or thelimit of the function, or the lateral limits. In[1]:=Limit[x/Sin[x],x->0]In[2]:=Limit[-x/Sin[x],x->0]-1 Then the function has no limit if x->0. In[1]:=Limit[x/Sin[x],x->0]In[2]:=Limit[-x/Sin[x],x->0]-1 Then the function has no limit if x->0.

For the next two limits we have: In[1]:=Limit[Abs[x^2-x-7],x->3]Limit[Abs[-7 - x + x ], x ->3] Directly, Mathematica does not offer the result ofthis limit, but we know that the limit of a function module is the limit modulefunction. In[2]:=Abs[Limit[x^2-x-7,x->3]] Another way to solve this problem is to use the Nlimit

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