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# Stroud Notation

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## Stroud Notation

(OP)
I have a handbook entitles Engineering Formulas 7th Edition by Kurt and Reiner Gieck. In it, they describe something called "Stroud notation", in which equations are written with units included for each term. I was taught to do this in college, but there was no mention of a notation named after somebody. Google and MillionShort are not finding anything.

Has anyone out there heard of this?

--
JHG

### RE: Stroud Notation

Sounds like they invented the name and named it after a beloved (or not) professor.

### RE: Stroud Notation

Just for fun, I googled "stroud's notation" and got two page of hits. Here are three of them.

In Defense of Moore's "Proof of an External World" -- https://reasonpapers.com/pdf/15/rp_15_7.pdf
(This one doesn't apply.)

Cubature Error Bounds for Analytic Functions -- https://www.ams.org/journals/mcom/1973-27-123/S002...
(This one doesn't apply. I found several papers on-line about cubature that refer to "Stroud's notation.")

A Handbook of Torsional Vibration -- https://books.google.com/books?id=LmEBdI7KJfcC&...'s%20notation%22&f=false
(This one says the following: "To distinguish between units of mass and force, Stroud's notation is used in this book. In this notation, Lb., Ton and Kg. are units of force, being the accepted weights of lb., ton and kg. masses." This is closer to what Gluck had in mind [I have the 3rd edition], but it's not the same.)

============
"Is it the only lesson of history that mankind is unteachable?"
--Winston S. Churchill

### RE: Stroud Notation

I was taught the method of including units within calculations in one of the introductory chemical engineering classes. It was called dimensional analysis.

### RE: Stroud Notation

(OP)
fel3,

That's interesting. I Googled "Stroud notation". You did "Stroud's"?

--
JHG

### RE: Stroud Notation

I've had some reviewers insist on this, but I find it really annoying. I'd rather ...
1) state the equation, say I = (bd^3)/12
2) list each variable, depending on the level of pedantic-ness ...
b = Xin
d = Yin
show a picture or a 1000 words describing these
3) then substitute ... I = (X*Y^3)/12 = Zin4

rather than I = ((Xin)*(Yin)^3)/12

another day in paradise, or is paradise one day closer ?

### RE: Stroud Notation

(OP)
rb1957,

I find the unit balances to be idiot resistant. If my length works out to s-2, I know I have goofed up somewhere.

--
JHG

### RE: Stroud Notation

This refers to "Engineering Units and the Stroud Convention" It doesn't strictly discuss dimensional analysis in the sense discussed here, though.

https://files.engineering.com/getfile.aspx?folder=...

TTFN (ta ta for now)
I can do absolutely anything. I'm an expert! https://www.youtube.com/watch?v=BKorP55Aqvg
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### RE: Stroud Notation

I don't recall ever hearing a name for this notation but we commonly used it starting our second year of undergrad during thermo and esp heat transfer, at least until we could cancel enough to work unitless. Thanks for the trivia!

### RE: Stroud Notation

Never heard of Stroud.
When the expression gets too busy I separate the quantities and the units into two clusters for clarity.

"If you don't have time to do the job right the first time, when are you going to find time to repair it?"

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