The fundamental nature of quantum mechanics (QM) has been mathematically demonstrated in [17]to be inconsistent with the indeterministic and probabilistic results. Indirect1, commutativemathematics and integral transformations contradict probabilistic results with exact functions anddemonstrates determinism in a quantum system - hence, this paper is written from a deterministicperspective (DP) in quantum mechanics.Quanta cannot be observed in their original state and are literally invisible, while mathematicaldescriptions of physical phenomena are historically built for observables.After a brief historic perspective, ‘invisables’ i.e. invisible entities of reality in mathematicaltreatment, are introduced. These entities can be handled by mathematics indirectly i.e. are describedin the transformed domain without variables violating the Heisenberg relation. The consequence isthat direct (incl. if existing: hidden) variables theories of counterpart mathematics are unsuitable fordescriptions of the reality of individual invisables.In nature, i.e. on micro and macro level, causality is fully ‘entangled’ with information in themeaning of ordered or coded energy. In contrast with the macro scale with many forms and types ofmemory functions, without a memory property of quanta, on the quantum scale, causality is thebearer of information-symmetry2: in a causal relation, the effect function includes all information ofthe cause function i.e. the last attained quantum states include all information of the causing states.Furtheron in this DP paper: mathematical and philosophical consequences and influences in severalparagraphs, regarding subjects such as ‘free will’ and expected ‘threats to science’, the Bellinequalities, Alice and Bob & entanglement, causality, information, retro-causality, spooky action,encryption and computing, teleportation, and in general interpretations rooted in indeterminacy inQM as well as associated topics on independence, fine tuning and interference — with the notion thatthis selection does not pretend completeness and calls for extensions from a deterministicperspective — in case not fitting as well - to test this DP proposal.The last paragraph outlines the mathematical treatment of QM more extensively and may clarifyreferences to the above mentioned topics of discussion in QM further.The aim of the paper is clarification whether deterministic QM is viable i.e. whether anystatefunction Ψ can be deterministic in the end; the paper is written with a minimum use ofmathematics for accessibility and readability (for the mathematics see [17]).