But I am seeking a mathematical solution

How would you account for that money mathematically?

So yes they are mathematically the same, one’s just simpler to understand in a instance

All other things being equal, pre-constructions are mathematically (much) better deals because you pay (much) less, assuming again that you're not overpaying, as a discount on an overpriced property is no discount.

I'm a high achiever, miniature boss-lady with a 140 IQ and an undergrad in mathematics.

.: @Chris SeveneyI've posted on other threads - i'm not really changing my strategy in response to the macro changes, just accepting less cash flow as long as I get the other benefits. mathematically speaking this is given as spread between bond and appreciation/cash flow has reduced LOL you would be okay as you are veteran on this lol

Everyone agrees (because it is mathematically correct) that to retire young the most important first step is a high savings rate. 

Not saying it’s not possible but it’s easy to rationalize stuff and do mathematics gymnastics to trick yourself into a lousy deal .

What are mathematical indicators people look at and where can one find ACTUAL and CORRECT data to support this?  

thxCarlos Richardson Mathematically this normally makes sense but I get nervous giving people advice to do this.