[31
August 2022] I got back into a
little maths study (it has only been
two years...) and I opened up my
text book and skimmed through the
first chapter.
In it
there are rules give for multiplying
or dividing by negative or positive
numbers and what result that will
give, either positive or negative.
But I have some queries:

Why does
multiplying negative numbers
together result in a positive
number? And,

Why does
dividing a negative number by
another negative number result in a
positive number?
We are
given the BODMAS rules (PEMDAS if
you are American). I remembered from
highscool that the contents of
brackets (parethesis) are calculated
first, but who came up with this
idea (it's merely a created rule and
not a underlying thing of the
universe)?
All that
seems to exist is it was someone
called Achilles Reselfelt in the
1800s.
Given
that this is such a widely taught
thing in mathematics is seems very
odd that there is nothing about this
person on the
Wikipedia page, or a history of
how things might have been done
prior to the rule being defined. It
appears from
Wikipedia that Mathematical
Notation began in the 16th century.
Further queries:
Fractions:
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