（information）is/was not mentioned

[lingkky]

I still got trouble in choosing the correct tense and I would like to get the help.

1.I have a book.The author is/was not mentioned in the book.The date and place of publishion is/was not mentioned too.

2.I do not know where the meeting will held. The venue of the meeting is/was not mentioned in the notice.

“Is “or “was”？

 

[srk]

I assume that the book still exists. I would use "is." ( ... is not mentioned too either)

If the notice is still posted — if it is still available to be read somewhere — I'd use "is." If the notice has been taken down, I'd use "was."

 

[lingkky]

I assume that the book still exists. I would use "is." ( ... is not mentioned too either)

If the notice is still posted — if it is still available to be read somewhere — I'd use "is." If the notice has been taken down, I'd use "was."

I wonder why "is mentioned " is still accepted since the notice writer did not mention it in the past when writing the notice.
Is there an logical explanation about it?

 

[Andygc]

As a general principle:
You are reading the book or notice now - present tense - the book/notice says.
You were reading the book or notice in the past - past tense - the book/notice said.

 

[srk]

I wonder why "is mentioned " is still accepted

You asked for a choice between "is/was" in "is/was not mentioned." I chose "is/was." The result is "is not mentioned."