Nonstandard Analysis A Practical Guide with Applications

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881

Robert Lutz Michel Goze

Nonstandard Analysis A Practical Guide with Applications

Springer-Verlag Berlin Heidelberg New York 1981

Authors

Robert Lutz Michel Goze Institut des Sciences Exactes et Appliquees, Universite de Haute Alsace 4, rue des Freres l.umiere, 68093 Mulhouse - Cedex, France

AMS Subject Classifications (1980): 03 Hxx, 34 Exx

ISBN 3-540-10879-3 Springer-Verlag Berlin Heidelberg New York ISBN 0-387-10879-3 Springer-Verlag New York Heidelberg Berlin

CIP-Kurztitelaufnahme der Deutschen Bibliothek Lutz, Robert: Nonstandard analysis: a pract. guide with applications 1 Robert Lutz; Michel Goze.Berlin; Heidelberg; New York: Springer, 1981. (Lecture notes in mathematics; Vol. 881) ISBN 3-540-10879-3 (Berlin, Heidelberg, New York) ISBN 0-387-10879-3 (New York, Heidelberg, Berlin) NE: Goze, Michel:; GT This work is subject to copyright. All rights are reserved, whether the whole or part of the material is concerned, specifically those of translation, reprinting, re-use of illustrations, broadcasting, reproduction by photocopying machine or similar means, and storage in data banks. Under § 54 of the German Copyright Law where copies are made for other than private use, a fee is payable to "Verwertungsgesellschaft Wort", Munich.

© by Springer-Verlag Berlin Heidelberg 1981. Printed in Germany Printing and binding: Beltz Offsetdruck, Hemsbach/Bergstr. 2141/3140-543210

Dialogue

On the University's premises,

- Are you familiar with the non-standard methods ? ???

- Non-standard Analysis, if you prefer I I ve

heard

about

Infinitesimals

and

the

like,

that

seem to be

coming back into fashion. But why call it a method? Because into

it's

not

fashion,

so

but

much

a

rather

question

of

of

bringing

furnishing

a

new

infinitesimals

proving

tool,

a

non-standard one for those unfamiliar with it. Do you intend to modify our standards

of

reasoning ? You would' nt

be the first ... But old math is good enough for me ! Not".

at

all

objects trick ever

The

non-standard

infinitesimals,

of language, asymptotic

for

method.

instance -

introduces

intermedi ate

by means of a very simple

in order to simplify the proofs

behaviours

are

concerned

mainly when-

and to make them close

to heuristic approaches. But

you

the

add something

frame

that

so

your

as

the

It's no

introduce

reasoning

Undoubtedly to

to

becomes

one

So, to

there

non

is

search

prove

nothing

classical for

known

new

proof,

the

is

or

But

is

is

classical

Enlarging

want it

no still

strictly

wonder

valid

?

equivalent

reasoning

about

the

equivalent to a classical one. in

there

latter.

results

non

same math

you

mathematics

every

usual mathematical objects a

simpler

Non-standard

standard

longer the

everything

your is

Your

method

also

a

method

you produce a

Because classical

is

pointless

if

one.

you I

have

o'-'efer

either

you

new result that you could,

after all, prove in another way. What's the gain? Your

are

one

of

those

who

prefer

of t