1

The sentence is:

"A line is composed of a lot of points. From now on(,) this point we call “one dimensional”

The options are:

1) "A line is composed of a lot of points. From now on, this point we call “one dimensional”

2) "A line is composed of a lot of points. From now on this point we call “one dimensional”

1

Commas are usually best used only when they clarify things. In this case I would use a comma.

So the first option (using a comma):

A line is composed of a lot of points. From now on, this point we call “one dimensional."

The following was part of my answer before the OP was edited:

{First, singular count nouns such as line almost always require a determiner. In most cases this will be an article. Thus, in standard English it will be A line... when talking about a typical line.}

| improve this answer | |
  • Regarding to "from now on - we called it". This defect happened after I changed the origin sentence "from now on, it's called etc." So, I changed the pronoun only, inadvertently. – Judicious Allure Nov 7 '15 at 0:54

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