Herbert Weir Smyth, A Greek Grammar for Colleges

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[*] 2298. Simple present or past conditions simply state a supposition with no implication as to its reality or probability. The protasis has the indicative, the apodosis has commonly the indicative, but also any other form of the simple sentence appropriate to the thought.

εἰ ταῦτα ποιεῖς, καλῶς ποιεῖς if you do this, you do well.

εἰ ταῦτα ἐποίησας, καλῶς ἐποίησας if you did this, you did well.

a. This form of condition corresponds to the logical formula if this is so, then that is so; if this is not so, then that is not so; if A = B, then C = D. The truth of the conclusion depends solely on the truth of the condition, which is not implied in any way. In these conditions something is supposed to be true only in order to draw the consequence that something else is true.

b. The conditional clause may express what the writer knows is physically impossible. Even when the supposition is true according to the real opinion of the writer, this form of condition is employed. In such cases εἴπερ is often used for εἰ. Both εἰ and εἴπερ sometimes have a causal force (2246); cp. si quidem and quia.

c. The simple condition is particular or general. When the protasis has εἴ τις and the apodosis a present indicative, the simple condition has a double meaning referring both to an individual case and to a rule of action. When a present general condition is distinctly expressed, ἐά_ν with the subjunctive is used (2337.)