Trigonometry I'll never use that.

[marinyork]

sorry, but I don't know what a semigroup is

Crudely have a set, do multiplication (or some other binary operation) on it and it is associative. Even more crudely one of the many things in existence where you start stripping away the 'rules' and see what happens.

I do sympathise with having to use excessive brackets in some limited areas of abstract algebra though .

 

[tyred]

A pint of cold water weighs a pound and a quarter

(according to my Mum)

How much does a pint of hot water weigh...

 

[swee'pea99]

I struggled at first until I realised the default setting on the calculator app I was using was Radians lol

Me too.

Or to put it another way, eh?

A pint of cold water weighs a pound and a quarter

(according to my Mum)

"A litre of water's a pint & three-quarters."

From a metrication leaflet we got at school.

 

[Hugh Manatee]

I have had to revisit trig lately. I am a trainer of surveyors and generally the kit does it all for you. Recently I have had to teach it at a college level and have had to show how to do it the long way.

The Cat Sat
On An Orange
And He Howled

As a 3 x 3 grid is how I remembered it. Surprisingly, considering how bad I was at maths at school, I got quite into it and even worked through a Tienstra calculation of my own.

 

[glasgowcyclist]

Must be time for this



[Damn thing won't let me start it at 0:34s]


GC

 

[fossyant]

Weirdo's the lot of you.

I stick it in my spreadsheets !! (accountant)

I did have to re-learn algebra in the last couple of years to help my son out for homework.

 

[nickyboy]

How much does a pint of hot water weigh...

A bit less....then decidedly less if you can get it above 100C

 

[midlife]

.......don't get me started on reverse polish notation on some of our school calculators!

Shaun

 

[Firestorm]

The one I remember is
Two and quarter pounds of jam
Weigh about a kilogram.

And
A litre of water's a pint and three quarters

 

[Firestorm]

.......don't get me started on reverse polish notation on some of our school calculators!

Shaun

My first scientific calculator, a Sinclair c 1976 , used reverse polish.

 

[jefmcg]

The one I remember is
Two and quarter pounds of jam
Weigh about a kilogram.

That's just odd. It's off by 50 grams. It seems odd to have a mnemonic to remember something incorrectly, especially as the maths is often easier if you know it's 2.2 lbs.

 

[pplpilot]

For those with an interest this is an absolute must watch - such a simple formula yet one if not the most complex proof.

http://www.bbc.co.uk/iplayer/episode/b0074rxx/horizon-19951996-fermats-last-theorem

 

[winjim]

A bit less....then decidedly less if you can get it above 100C

Depending on the pressure.

 

[Tail End Charlie]

May I have a drink, alcoholic, of course, after the heavy chapters involving quantum mechanics? 3.14159265358979

 

[glasgowcyclist]

My first scientific calculator, a Sinclair c 1976 , used reverse polish.

I had one of those, in a wee white case that doubled as a stand. Great bit of kit.

GC