in discussion Classroom discussions / Per page discussions » Introduction

Hi, Iam hopefull that the author of this page or maintainer is still alive and well since the posts date back on 2008 and we now have 2020!!!

Excuse my little bit of fun.

I have started reading the english translation of kiselev's book and i have an inquiry as to the meaning of one of the very first statements on the introduction in page 1.

the statement concerning the definition of a surface and i quote:

"A geometric solid is separated from the surrounding space by a surface".

I might be completely off here with my reasoning or my trying to understand what is clearly meant by that statement since English is not my first language.

If i may present what i mean by me finding the meaning of the statement a bit ambiguous.

Prior to this statement a definition of what constitutes a geometric solid is provided such that:

" the part of space occupied by a physical object is called a geometric solid"

Which leds me to think that a geometric solid occupying physical space manifests itself in 3 dimensions namely length, width or thickness (x,y,z) otherwise it could not be occupying physical space and as such cannot be declared to be a geometric solid. Following from that anything that does not manifest itself in (x,y,z) is not a geometric solid.

I am hoping or assuming that my reasoning so far is correct.

Now, when we do have a geometric solid folowing from kiselovs statement what separates the surrounding space from the solid is a surface. Now geometric solids other than the shpere have more than one sides or surface? Would surface refer to the sum of those sides or a surface would refer to one of the sides of the geometric solid at any one time?

Thank you for your time.