Lean Startup, Mathematical Modeling, Applied Mathematics, Metrics.
But the solar system and my Aunt Joan are also 2. And 1 explosion + 1 cat = 2. Now the usefulness of this model is starting to slip. 1+1=2 is not ever less ‘true’ but it is certainly less meaningfully connected to what we are modeling in some case than in others. Here’s a few more I like: 1 quark +