"My username is mehtamatics." is a non-mathematical sentence.
kinds of mathematical sentences
algebra: 5[2x3(22-13)+3] mathematical: 5x2
Only one of these is a sentence: That's nice of you to say. It's nice of you to say so. If you know which is which, you have knowledge of sentences and non-sentences.
Sentences made up of numbers; a mathematical equation is a number sentence. pie rocks
a number sentence is for example.9+9=18 ,any mathematical equation
X and y
Single word answers that we see many of on this site are "non sentences"
the use of essential and non-essential sentences
An inequality would one type of such sentences. Example: x < 4 .
It is non essential to play video games 24/7.
This is non-sensical.
Because the difference between 100,000,000 and -100,000,000 is greater than a hyphen. Mathematical sentences without symbols would be as nonsensical as regular sentences without verbs: they tell you what to do.