Your F4 screen tells you a lot!
Combine it with the info the trade-screen gives you and you should be able to work it out.
F4 screen columns:
1st column: techs you have that the other civ doesn't
2nd column: techs that can be researched by the other civ
3rd column: techs he has and can trade to you if you have the right prereqs
4th column: techs he has but can't trade to you despite that you have the right prereqs b/c of no tech brokering.
conclusion: column 1 and 2 tell you what techs a civ hasn't, column 3 and 4 tell you what he has.
column 1 and 2 give hints about what prereq. techs someone may be missing.
(ie. philosophy is not in any of the columns, but meditation is in the 2nd column, now you can be sure that the civ has no philosophy, b/c he doesn't even have meditation yet)
Combine it with the info the trade-screen gives you and you should be able to work it out.
F4 screen columns:
1st column: techs you have that the other civ doesn't
2nd column: techs that can be researched by the other civ
3rd column: techs he has and can trade to you if you have the right prereqs
4th column: techs he has but can't trade to you despite that you have the right prereqs b/c of no tech brokering.
conclusion: column 1 and 2 tell you what techs a civ hasn't, column 3 and 4 tell you what he has.
column 1 and 2 give hints about what prereq. techs someone may be missing.
(ie. philosophy is not in any of the columns, but meditation is in the 2nd column, now you can be sure that the civ has no philosophy, b/c he doesn't even have meditation yet)
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