Other useful theorems and quotes of the kind very intelligent people without realising how they come across...
Theorem "If it's worse than square root of 51 then you've done it wrong"
"Going from 1 to 2 is one of the most important and most difficult steps in the whole of mathematics"
"The output equation is what we put on the end so that we get the right answer"
"This proved by Cayley & Hamilton - the Patron Saints of Linear Algebra"
"We then hit this expression with out Cayley & Hamilton hammer"
"A matrix with repeated eigen values is not something we talk about in decent society"
"a function is a sausage machine"
"by the end of this course you will be able to tell the difference between an orange and a doughnut"
Proof by "if you stare at it long enough you will be able to see that it is true"
Theorem "Every function is continuous and differentiable unless it obviously isn't"
"This is the garbage in - garbage out principle"
Proof "because we use a reasonable sensible function, we're not talking pathological functions here"
Proof "on the assumption that the functino isn't that stupid"
"stuff minus same stuff =0"
"If we stand back and look at this more closely"
"I see that we have minus one minutes left so in that time I'll..."