Упр.1 Appendix 1 Математика ГДЗ Enjoy English 10 класс

Read the quotations. Which of them is not about mathematics?

All sciences require mathematics.
Roger Bacon (1214–1292)

I know that two and two make four — and should be glad to prove it too if I could — though I must say if by any sort of process I could convert 2 and 2 into five it would give me much greater pleasure.
Lord Byron (1788–1824)

Mathematics may be defined as the subject in which we never know what we are talking about, nor whether what we are saying is true.
Bertrand Russell (1872–1970)

As far as the laws of mathematics refer to reality, they are not certain, and as far as they are certain, they do not refer to reality.
Albert Einstein (1879–1955)