[monista]

And they were right imho. Having a clear notion of a subject is good for both physics and mathematics, but what's good for physics or engineering, is not enough for math, in math, you also need rigorous reasoning, or you'll fall into subtle mistakes.

[HelloNurse]

Fundamentally, without sufficient rigor there can be no proofs; "maybe" and "someone says so" aren't good theoretical building blocks.